.NET > Core

A library designed to integrate the Dapper and graphql-dotnet projects with ease-of-use in mind and performance as the primary concern.

ASP.NET Core MiddleWare to create a GraphQL end-point.

This library is a complementary layer on top that allows you to automatically wrap your .NET classes into GraphQL schema definitions using existing property getters and methods as field resolvers

GraphiQL middleware for ASP.NET Core.

GraphQL for .NET Core based on https://github.com/graphql/graphql-js.

GraphQL for .NET.

GraphQL for .NET - Subscription Transport WebSockets.

GraphQL server for .Net Core and .NET Framework.

FSharp implementation of Facebook GraphQL query language https://fsprojects.github.io/FSharp.Data.GraphQL.

A lexer and parser for GraphQL in .NET.

GraphQL execution and server libraries supporting SignalR, Apollo, schema manipulation and other features familiar from Apollo and graphql-js

Adds FluentValidation rules to swagger.

A bunch of useful filters for Swashbuckle.AspNetCore.

ASP.NET Boilerplate is a general purpose application framework especially designed for new modern web applications. It uses already familiar tools and implements best practices around them to provide you a SOLID development experience.

Abp vNext is the next generation of the open source ASP.NET Boilerplate framework. It's a complete architecture and strong infrastructure to create modern web applications! Follows best practices and conventions to provide you a SOLID development experience.

A helper library for async/await.

Efficient reliable UDP unicast, UDP multicast, and IPC message transport - .NET port of Aeron.

Toolkit and runtime for building highly concurrent, distributed, and fault tolerant event-driven applications on .NET & Mono.

Aggregates.NET is a framework to help developers integrate the excellent NServiceBus and EventStore libraries together.

Allows building real-time web apps and native apps with minimal effort. Define a Web API and Subscription API that automatically synchronizes datasets across connected clients.

An EventBus with local persistent message functionality for system integration in SOA or Microservice architecture.

Carter is a library that allows Nancy-esque routing for use with ASP.Net Core.

Lightweight Alternative to Electron.NET, Electron for .NET/.NET Core.

ETL Framework for .NET (Parser / Writer for CSV, Flat, Xml, JSON, Key-Value formatted files).

Lightweight framework for helping writing CQRS and Eventsourcing applications in C#.

The DataAccess Toolbox contains the base classes for data access in ASP.NET Core with Entity Framework Core 1.0 using the unit-of-work and repository pattern.

Lightweight and Extensible Infrastructure for Building High Quality Web Applications Based on ASP.NET Core.

.NET Core library for loading assemblies as a plugin.

DotnetSpider, a .NET Standard web crawling library similar to WebMagic and Scrapy. It is a lightweight ,efficient and fast high-level web crawling & scraping framework for .NET.

Port of netty, event-driven asynchronous network application framework.

Open source MVVM framework for Web Apps.

Build cross platform desktop apps with ASP.NET NET Core.

A tiny, cross-platform, module based web server for .NET Framework and .NET Core.

Ether.Network is an open source networking library that allow developers to create simple, fast and scalable socket server or client applications over the TCP/IP protocol.

Async/await first CQRS+ES and DDD framework for .NET.

Lightweight and fast library written in C# for reading Microsoft Excel files.

Finbuckle.MultiTenant is a .NET Standard library for multitenant support designed for ASP.NET 2.0+. It provides functionality for tenant resolution, per-tenant app configuration, and per-tenant data isolation.

A secure communication stack for .NET using JSON-RPC over SSL.

gRPC based HTTP/2 RPC Streaming Framework for .NET, .NET Core and Unity.

Distributed Application Framework for .NET.

An open source .NET microservices framework.

Extensions to LINQ to Objects.

Lightweight, low-ceremony, framework for building HTTP based services on .NET and Mono.

.NET Framework wrapper for OpenCV.

Framework that provides a straight-forward approach to building distributed high-scale computing applications, without the need to learn and apply complex concurrency or other scaling patterns.

Prism is a framework for building loosely coupled, maintainable, and testable XAML applications in WPF, Windows 10 UWP, and Xamarin Forms.

Ultra fast distributed actors for Golang and C# http://proto.actor.

16-bit wide vector space search engine with HTTP API and pluggable read/write pipelines.

ASP.Net Core RESTful microservice framework that focusing on speed and ease of use.

Thoughtfully architected, obscenely fast, thoroughly enjoyable web services for all https://servicestack.net.

A library enabling strongly typed routing in ASP.NET Core MVC projects.

Surging is a micro-service engine that provides a lightweight, high-performance, modular RPC request pipeline. The service engine supports http, TCP, WS, Mqtt, UDP, and DNS protocols. It uses ZooKeeper and Consul as a registry, Hash Algorithms, random, polling, pressure minimum priority as a load balancing algorithm, built-in service governance to ensure reliable RPC communication.

A simple library for creating applications based on the CQRS pattern with support for attribute routing and hosted handlers. Developed in C# targeting .NET Standard 1.0.

Library for easily paging through any IEnumerable/IQueryable in ASP.NET/ASP.NET Core.

Fast Serverless Functions for Kubernetes.

Remote Procedure Calls (RPCs) provide a useful abstraction for building distributed applications and services. The libraries in this repository provide a concrete implementation of the gRPC protocol, layered over HTTP/2. These libraries enable communication between clients and servers using any combination of the supported languages.

Project templates with batteries included, providing the minimum amount of code required to get you going. Includes ASP.NET Core API and GraphQL Templates.

ASP.NET Core 2.0 / React SPA Template App.

Asp.Net Core 2+ & Angular 6 SPA with Angular CLI full featured application.

A ready-to-use templates for ASP.NET MVC 5 and ASP.NET Core with repositories, services, models mapping and DI and StyleCop warnings fixed.

Enable feature folders for MVC controllers and views in ASP.NET Core.

Template for Webpack, Visual Studio, ASP.NET Core and Angular. Both the client and the server side of the application are implemented inside one ASP.NET Core project which makes it easier to deploy.

A starting point for Clean Architecture with ASP.NET Core. Clean Architecture is just the latest in a series of names for the same loosely-coupled, dependency-inverted architecture. You will also find it named hexagonal, ports-and-adapters, or onion architecture.

Solution template for creating a Single Page App (SPA) with Angular 8 and ASP.NET Core 3 following the principles of Clean Architecture

Boilerplate project templates based on DNTFrameworkCore

dotnet new templates with awesome architecture styles! Increases productivity to design layered applications based on Hexagonal, Clean or Event Sourcing architectures styles. It supports multiple data access frameworks (MongoDB, EntityFramework, Dapper or Kafka) and it is completely testable.

Provides developer resources with simple use cases to build scalable applications on top of .NET Core with architectural best practices (DDD, onion architecture etc)

An HTML5, jQuery-based widget library for building modern web apps. http://www.telerik.com/kendo-ui.

ASP.NET Core / Angular4 startup project template with complete login, user and role management.

Serenity is an ASP.NET MVC / TypeScript application platform designed to simplify and shorten development of data-centric business applications with a service based architecture.

Boilerplate for building single page apps. Server is multi-project .Net Core solution designed around SOLID principles. Client is TypeScript 2, Vuejs 2, Vuex 2.

OpenID Connect/OAuth2 server framework for OWIN/Katana and ASP.NET Core.

Hosted, enterprise-grade platform for modern identity.

Authorization library that supports access control models like ACL, RBAC, ABAC in C#

ASP.NET Core Identity is the membership system for building ASP.NET Core web applications, including membership, login, and user data.

IdentityServer for ASP.NET Core 1.0 & 2.0

EntityFramework persistence layer

MongoDB persistence layer

Entity Framework Core persistence layer

dotnet cli templates for IdentityServer4.

Hosted, enterprise-grade platform for modern identity.

Easy-to-use OpenID Connect server for ASP.NET Core.

OAuth 2.0 and OpenID Connect debugging tool.

Build simple, secure web applications with Stormpath and ASP.NET Core.(Deprecated: It will longer get updated as of March 2017 after joining OKTA)

Library for impersonating users during development leveraging ASP.NET Identity.

A cross platform, self-hosted server compatible with Bitpay API.

An integrated Ethereum implementation and tool suite focused on Solidity testing and development.

Comprehensive Bitcoin library for the .NET framework.

.NET standard library for building blockchain enabled applications

A Bitcoin and Altcoin lightweight block explorer.

Open Network For Smart Economy.

.NET Core Ethereum client

Simple and affordable end-to-end solutions for development, testing and deployment of native C# blockchain applications on the .Net framework.

Cross platform C# library for talking to the Trezor Hardwarewallet

Privacy focused, ZeroLink compliant Bitcoin wallet.

The Open Source AI Chatbot Platform Builder in 100% C# Running in .NET Core with Machine Learning algorithm.

Open source, general-purpose Discord chat bot written in C#.

C# Telegram Bot API library.

F# Telegram Bot Api library.

Cross platform build automation system.

Style your C# console output!

The base Docker images for working with .NET Core and the .NET Core Tools.

.NET Cli Tool to package your .NET Core Application into a docker image: 'dotnet dockerize'

A cross platform build and deployment automation system for building projects and executing deployment scripts using C# code.

Git and SemVer Info from MSBuild, C# and VB.

Stamp your assemblies and NuGet packages with a version from a single, simple version.txt file and include git commit IDs for non-official builds.

Go wrapper for the .NET Core Runtime.

PowerShell module which ports existing Windows application workloads to Docker.

Run your AppVeyor builds, locally.

The Microsoft Build Engine is a platform for building applications.

Cross-platform build automation system.

Stack Exchange's Monitoring System.

Visual Studio Team Services Build and Release Agent.

Visual Studio extension that let's you configure bundling and minification of JS, CSS and HTML files.

ASP.NET MVC ViewEngine for rendering markup in a JavaScript environment. Ideal for React and Angular server-side rendering.

Lightweight runtime CSS/JavaScript file minification, combination, compression & management library for ASP.NET Core.

.NET library that contains a set of markup minifiers. The objective of this project is to improve the performance of web applications by reducing the size of HTML, XHTML and XML code.

Open source caching abstraction layer for .NET written in C#. It supports various cache providers and implements many advanced features. http://cachemanager.michaco.net

Open source caching library that contains basic usages and some advanced usages of caching which can help us to handle caching more easily.

Fast key-value store from Microsoft Research.

Libraries for in-memory caching and distributed caching.

High performance general purpose redis client for .NET languages (C# etc).

A common interface with in memory, redis and azure implementations.

An easy to use .NET API for RabbitMQ.

The open-source, functional database with Complex Event Processing in JavaScript.

Simple, unambitious mediator implementation in .NET.

MediatR extensions for Microsoft.Extensions.DependencyInjection.

A simple mediator for .Net for sending command, publishing event and request response with pipelines supported.

Simple in process mediator for .NET.

MQTTnet is a high performance .NET library for MQTT based communication.

100% native C# implementation of ZeroMQ for .NET.

NServiceBus is part of the Particular Service Platform, which contains tools to build, monitor, and debug distributed systems.

.NET Core library for DDD, CQRS and Event Sourcing with Azure Service Bus integration. Supported database providers for the Command and the Event stores are: DocumentDB, MongoDB, SQL Server, MySQL, PostgreSQL and SQLite.

RabbitMQ .NET client https://www.rabbitmq.com.

Modern .NET framework for communication over RabbitMq.

Simple and lean service bus implementation for .NET.

Framework to build event-driven applications (support for Kafka, RabbitMQ, MQTT).

Simple, easy to use library for distributed job/worker logic. Distributed messages handled by built in RabbitMQ implementation.

Awesome CMS Core is an open source CMS built using ASP.Net Core & ReactJS with module separation concern in mind and provide lastest trend of technology

ASP.NET applications to provide common blogging functionality.

Open source .NET Core CMS and modular application framework. Code-first, unobtrusive and extensible.

Simple ASP.NET Core wiki that we are working on during live coding streams.

The original DasBlog reimagined with ASP.NET Core

O/S ASP.Net Core/.Net Core CMS with paid for modules: JSON content, works with variety of data stores, c# content types

An ASP.NET Core blogging engine.

Open Source CMS powered by DotNet Core. Mixcore CMS is a scalable, open platform for web content management and digital experiences. Mixcore CMS provides deep capabilities and endless flexibility on the web.

An Open source ASP.NET Core 2.0 CMS. It currently supports MySQL and planned to implement MSSQL, SQLite and PostgreSQL. Also it is a modular CMS supports theme, skin, custom layout, widgets, multiple language (En, BN).

Open Source Content Management System built with ASP.NET Core on top of a Modular and Extensible Application Framework.

A Lightweight & Unobtrusive Open Source CMS for ASP.NET Core and Entity Framework Core.

Simple, yet flexible content and blog engine for ASP.NET Core that can work with or without a database.

Headless CMS, based on MongoDB, CQRS and Event Sourcing.

Open source ASP.NET Core 2.x CMS. It currently supports MS SQL and planned to implement MSSQL, SQLite in the near future. It has many built-in features out of the box like multilanguage support, theme, template...

An extensible and friendly Open source ASP.NET Core CMS

Open source ASP.NET Core CMS based on DDD and CQRS. It supports MSSQL, MySQL, SQLite and PostgreSQL out of the box.

Modular static content and static site generator.

Visual design, build site onlie by drag and drop.

Tool that uses Roslyn to automatically rewrite the source to follow netfx coding styles. Nuget Package

A set of IDE plugins and rules that provide security "linting" capabilities.

Refactoring Essentials for Visual Studio.

.NET Compiler Platform ("Roslyn") Analyzers.

StyleCop rules using the .NET Compiler Platform.

App Metrics is an open-source and cross-platform .NET library used to record and report metrics within an application and reports it's health.

Small framework to audit .NET object changes.

Powerful .NET library for benchmarking.

Cross platform code coverage library for .NET Core.

Minimalist Code Coverage Tool for .NET Core.

Performance benchmarking and testing framework for .NET applications.

Library for collecting application metrics in .NET and exporting them to Prometheus.

Code coverage tool for .NET 2 and above (WINDOWS OS only), support for 32 and 64 processes with both branch and sequence points.

.NET Core Application Performance Monitor.

.NET Client for https://prometheus.io.

.NET Client for Prometheus.

Push metrics to a PushGateaway for the Prometheus.Client.

Middleware for the Prometheus.Client.

MetricServer for the Prometheus.Client.

Metrics logging of request durations for the Prometheus.Client.

Ultra fast compression algorithm for all .NET platforms.

Fully managed C# library to deal with many compression types and formats.

F# to JavaScript Compiler.

A parser combinatory library for F# and C#.

A translator for ECMA-335 CIL/MSIL to C language.

A dynamically typed scripting language written in C# with a REPL, debugger, and simple embedding API.

Open-source PHP compiler to .NET.

A lightweight, fast and flexible parsing library for C#, developed at Stack Overflow.

The .NET Compiler Platform ("Roslyn") provides open-source C# and Visual Basic compilers with rich code analysis APIs.

Tiny C# Monadic Parser Framework.

Bringing updates to the original bcrypt package.

.NET Core port of BCrypt.NET used to store passwords securely.

The Bouncy Castle Crypto package is a C# implementation of cryptographic algorithms and protocols.

A general purpose hashing library, but a library to encode/decode Multihashes which is a "container" describing what hash algorithm the digest is calculated with.

NSec is a new cryptographic library for .NET Core based on libsodium.

Hig level crypto library used .Net primitives, has been professionally audited.

C# .NET MONO NOSQL (key value store embedded) ACID multi-paradigm database management system.

Simple JSON flat file data store with support for typed and dynamic data.

.NET NoSQL Document Store in a single data file - http://www.litedb.org.

"no database" file system storage for .NET Core/ASP.NET Core because not every project needs a database.

Postgresql as a Document Database and Event Store for .NET Applications http://jasperfx.github.io/marten.

StringDB is a modular, key/value pair archival DB designed to consume tiny amounts of ram & produce tiny databases.

.NET document database working on any RDBMS.

DataStax C# Driver for Apache Cassandra.

Confluent's Apache Kafka .NET client.

A lightweight, document-oriented (NoSQL), syncable database engine for .NET.

.NET Driver for MongoDB.

A data access library for MongoDB with an elegant api, LINQ support and built-in entity relationship management

Connector/Net is a fully-managed ADO.NET driver for MySQL.

Async MySQL Connector for .NET and .NET Core.

Neo4j Bolt driver for .NET.

.NET client binding for Neo4j.

.NET data provider for PostgreSQL. It allows any program developed for .NET framework to access a PostgreSQL database server. It is implemented in 100% C# code. PostgreSQL versions since 9.1 are officially supported, others may work. http://www.npgsql.org

Linq enabled document database for .NET.

C#/.NET RethinkDB driver with 100% ReQL API coverage.

.NET client for Tarantool NoSql database.

Async MySQL Connector for .NET and .NET Core.

Async MySQL Connector for .NET and .NET Core.

.NET library that helps you to deploy changes to SQL Server databases. It tracks which SQL scripts have been run already, and runs the change scripts that are needed to get your database up to date.

Simple database migration tool that uses plain SQL scripts. Inspired by Flyway.

Entity Framework Core Power Tools - reverse engineering, migrations and model visualization for EF Core.

Migration framework for .NET much like Ruby on Rails Migrations.

Get SQL Server notification on record table change.

Database Migration Utility for .NET using sql files and versioning based on source control.

Server implementation of SapphireDb, a framework for easy development of applications with realtime data synchronization and a self hosted alternative to firebase realtime database/firestore for asp.net core and ef core. Check out the documentation for more details: Documentation

SharpRepository is a generic repository written in C# which includes support for various relational, document and object databases including Entity Framework, RavenDB, MongoDb and Db4o. SharpRepository includes Xml and InMemory repository implementations as well.

Change-tracking across service boundaries with .NET Core.

Mongo.Migration is designed for the MongoDB C# Driver to migrate your documents easily and on-the-fly. No more downtime for schema-migrations. Just write small and simple migrations. Link

A plugin for Microsoft.EntityFrameworkCore to add support of encrypted fields using built-in or custom encryption providers.

DateTimeRange, Business Day and various DateTime, DateTimeOffset, TimeSpan extension methods.

Allows you to write cleaner DateTime expressions and operation. Partially inspired by Ruby DateTime Extensions.

Better date and time API for .NET http://nodatime.org.

Enterprise HealthChecks for ASP.NET Core Diagnostics Package

Enable load balancers to monitor the status of deployed Web applications

Next generation application development framework for .NET

RAFT consensus in .NET Core

An observable microservice bus .NET library that wraps the underlying transport in simple Rx based interfaces

API Gateway created using .NET Core

Vendor-neutral APIs and instrumentation for distributed tracing

.NET 3.5 / 4.0 / 4.5 / PCL library that allows developers to express transient exception and fault handling policies such as Retry, Retry Forever, Wait and Retry or Circuit Breaker in a fluent manner

Toolkit to create code-first HTTP reverse proxies on ASP.NET Core

Free open-source ecommerce shopping cart (ASP.NET MVC / ASP.NET Core MVC ) with a vast community and a market place full of new features, themes and plugins.

Multi-platform, free, open source ecommerce shopping cart based on ASP.NET Core 2.1 and MongoDB derived from nopCommerce.

.NET SDK for PayPal's RESTful APIs.

Super simple ecommerce system built on .NET Core.

Typed .NET clients for stripe.com REST APIs.

High performance understanding for stack traces (Make error logs more productive).

GlobalExceptionHandlerDotNet allows you to configure exception handling as a convention with your ASP.NET Core application pipeline as opposed to explicitly handling them within each controller action.

.NET SDK for Sentry, an Open-source error tracking that helps developers monitor and fix crashes in real time.

Exceptionless .NET Client

Portable logging abstraction for .NET.

Logstash logging extension for .NET Core applications with UDP and Redis transports.

Error logging library that includes features like error filtering and the ability to view the error log from a web page.

A lightweight library which implements file logging for the built-in .NET Core logging framework (Microsoft.Extensions.Logging).

Single file for you to either copy/paste or install via nuget, into your library/ framework/ application to provide a logging abstraction.

log4net is a port of the excellent Apache log4j framework to the Microsoft .NET runtime.

Advanced .NET, Silverlight and Xamarin Logging with support for structured and non structured logging.

NLog integration for ASP.NET & ASP.NET Core 1-3

NLog Provider for Microsoft.Extensions.Logging for .NET Standard libraries and .NET Core applications

NLog targets specific for Windows.Forms

Alternative Mail target using the using MailKit library

Log appender for the build in ASP.NET Core logging to send all logs to Application Insights.

Simple .NET logging with fully-structured events.

Serilog integration for ASP.NET Core 2+.

Serilog.Exceptions is an add-on to Serilog to log exception details and custom properties that are not output in Exception.ToString().

A Serilog configuration provider that reads from Microsoft.Extensions.Configuration.

Functional Extensions for C#.

Reactive collections based on Rx.NET.

Actor library for C# with additional modules that support persistence to Redis, as well as JS integration.

Random Testing for .NET.

A native ASP.NET Core web framework for F# developers.

C# functional language extensions and 'Erlang like' concurrency system.

Utility library for programming functionally in C#.

Effortlessly send messages anywhere on the network using Reactive Extensions (RX). Transport protocol is ZeroMQ.

A robust option type for C#.

Reactive Streams for .NET.

A MVVM framework that integrates with the Reactive Extensions for .NET to create elegant, testable User Interfaces that run on any mobile or desktop platform.

The Reactive Extensions for .NET.

Reactive queryable observable framework. 4.x.x or above

Functional Reactive Programming (FRP) Library. 4.x.x or above

.NET bindings for GLFW.

A fluent wrapper around System.Drawing for the processing of image files http://imageprocessor.org. 4.5.x or above

Cross-platform library for processing of image files written in C#.

.NET/Mono bindings for libvlc, the multimedia framework powering the VLC applications made by VideoLAN.

The .NET library for ImageMagick.

MagicScaler high-performance, high-quality image processing pipeline for .NET

A pure C# Open Source QR Code implementation.

C# bindings for the bgfx graphics library.

Image processing library for use in .NET applications that supports .NET Core.

A low-level, hardware-accelerated 3D graphics library for .NET.

.Net port of the original java-based barcode reader and generator library zxing.

Lightweight UI toolkit for WPF applications offering classic but enhanced windows visuals.

A multi-platform .NET UI framework (formerly known as Perspex).

The Avalonia-based text editor component forked from AvalonEdit

Contains some simple and commonly used WPF controls.

Lara Web Engine is a library for developing Web user interfaces in C#

library to create progress bars in console programs

A cross-platform Qml/.NET integration for Mono/.NET/.NET Core.

A simple, direct, ultra-thin CLR library for high-performance Win32 Native Interop with automation, windowing, DirectX, OpenGL and Skia helpers.

MonoDevelop enables developers to quickly write desktop and web applications on Linux, Windows and Mac OS X. It also makes it easy for developers to port .NET applications created with Visual Studio to Linux and Mac OS X maintaining a single code base for all platforms.

SharpDevelop is a free Integrated Development Environment (IDE) for C#, VB.NET, Boo, IronPython, IronRuby and F# projects on Microsoft's .NET platform. It is written (almost) entirely in C#, and comes with features you would expect in an IDE plus a few more.

New type of tool that combines the simplicity of a code editor with what developers need for their core edit-build-debug cycle. Code provides comprehensive editing and debugging support, an extensibility model, and lightweight integration with existing tools.

Localization abstractions and implementations for ASP.NET Core applications.

Database Resource Localization for .NET Core with Entity Framework and In Memory Cache

Database driven resource localization for .NET applications.

Super-fast compile-time dependency injection using IL weaving.

Addictive .NET IoC container.

Castle Windsor is a best of breed, mature Inversion of Control container available for .NET.

Fast, small, full-featured IoC Container for .NET.

Grace is a feature rich Dependency Injection Container designed with ease of use and performance in mind.

Dependency Injection Automation for AspNetCore

Fast Inversion of Control Tool and Sundry Items of Roslyn Chicanery.

Ultra lightweight IoC container.

Easy, flexible, and fast Dependency Injection library that promotes best practice to steer developers towards the pit of success.

A lightweight, portable dependency injection framework for .NET based solutions.

A lightweight, extensible dependency injection container.

Machine learning, computer vision, statistics and general scientific computing for .NET.

Cross-platform Natural Language Processing (NLP) library inspired by spaCy, with pre-trained models, out-of-the box support for training word and document embeddings, and flexible entity recognition models. Part of the SciSharp Stack

Cross-platform open-source machine learning framework which makes machine learning accessible to .NET developers http://dot.net/ml.

Series and Panels for Real-time and Exploratory Analysis of Data Streams.

TensorFlow API for .NET languages.

itmap & tilemap generation from a single example with the help of ideas from quantum mechanics.

A C# deep learning library, human friendly, CUDA/OpenCL supported, well structured, easy to extend

All in one email sender for .NET and .NET Core

Create transactional email with a fluent interface (.NET).

Cross-platform .NET library for IMAP, POP3, and SMTP.

SMTP mail client library which provides comfortable mail merge capabilities for text, inline images and attachments, as well as good throughput and fault tolerance for sending mail messages.

Cross-platform .NET MIME creation and parser library with support for S/MIME, PGP, DKIM, TNEF and Unix mbox spools.

a .Net Fake SMTP Server used for testing. Clone of the popular Dumbster.

Simple Desktop SMTP Server

C# library that moves your stylesheets to inline style attributes, for maximum compatibility with E-mail clients.

C# library for the SendGrid v3 mail endpoint.

Library to create your own SMTP server.

Client for SendGrid's v3 API. Not only allows you to send emails, but also allows you to bulk import contacts, manage lists and segments, create custom fields for your lists, etc. Also includes a parser for SendGrid Webhooks.

A library that provides fast, accurate and automatic differentiation (computes derivative / gradient) of mathematical functions.

Expansible Unit Conversion Library for .NET Core and .NET Framework.

Units.NET gives you all the common units of measurement and the conversions between them.

Extracts metadata from media (images, video, audio) with a simple to use API.

Library to improve P/Invoke-ing native code. Interact with native objects as if they were first class objects.

The ultimate angle brackets parser library. It parses HTML5, MathML, SVG and CSS to construct a DOM based on the official W3C specification. Comparable to beautifulsoup4 of python.

AgileMapper is a zero-configuration, highly-configurable object-object mapper with viewable execution plans.

ASP.NET Core Extension Library.

Convention-based object-object mapper in .NET.

A lightweight NuGet server.

A Windows native DLL injection library.

A .NET package for describing and running targets and their dependencies.

Castle Core, including Castle DynamicProxy, Logging Services and DictionaryAdapter http://www.castleproject.org.

Railway-oriented programming for .NET http://fsprojects.github.io/Chessie.

Wrapper for command line interfaces.

Model your command line application interface in a class.

The implementation of CommonMark specification in C# for converting Markdown documents to HTML.

Fluent library to create table for .NET console application.

A library that can quickly format and convert geographic coordinates as well as provide location based sun and moon information (sunset, sunrise, moon illumination, etc...).

Microsoft ASP.NET server-side support and helpers for jQuery DataTables.

C# .NET Core wrapper for wkhtmltopdf library that uses Webkit engine to convert HTML pages to PDF.

A .NET library to load environment variables from .env files.

A fast globbing library for .NET / .NETStandard applications. Outperforms Regex.

A .NET Core global tool to display and update outdated NuGet packages in a project

Run C# scripts from the .NET CLI.

Simple command-line HTTP server for .NET Core CLI.

Downloader is a modern, fluent, asynchronous, testable and portable library for .NET. This is a multipart downloader with asynchronous progress events.

A simple HTML generation library

Enums.NET is a high-performance type-safe .NET enum utility library

Fast ExpressionTree compiler to delegate.

Commands, Services and Fluent API for docker, docker-compose & docker-machine, for win/mac/linux and native docker.

FTP and FTPS client, with extensive FTP commands, SSL/TLS connections, hashing/checksums and more.

Extensible tool for weaving .net assemblies

High Dynamic Range (HDR) Histogram.

.NET Standard library for intercepting server-side HTTP dependencies.

Humanizer meets all your .NET needs for manipulating and displaying strings, enums, dates, times, timespans, numbers and quantities.

Write and maintain AWS Cloudformation templates using C#.

Static interface to dynamic implementation (duck casting). Uses the DLR combined with Reflect.Emit.

ASP.NET Core Server Side Processing library for Jquery DataTables with Multiple Column Filtering, Sorting and Pagination at database level with Excel Export and TagHelper support.

.NET wrapper around the libSass library with the ability to support a virtual file system.

Fast, powerfull, CommonMark compliant, extensible Markdown processor for .NET.

Simple library to move a .NET Core app runtime components and dependencies into a sub-directory and make it beauty.

Simple library to made parsing CLI arguments easy. Library also allow to print usage help "out of box".

Parses string expressions (formulas, methods calls, conditions) to LINQ expression tree that can be compiled to lambda and evaluated.

Website with statistics of NuGet packages download count.

An implementation TOTP RFC 6238 and HOTP RFC 4226 in C#.

Replace any .NET method (including static and non-virtual) with a delegate

Puppeteer Sharp is a .NET port of the official Node.JS Puppeteer API.

Pure C# GNU-Readline like library for .NET/.NET Core.

Framework to drastically simplify your private reflection code using C# dynamic

With re-linq, it's now easier than ever to create full-featured LINQ providers.

Remote Linq is a small and easy to use - yet very powerful - library to translate LINQ expression trees to strongly typed, serializable expression trees and vice versa.

Html to Markdown converter library.

PdfReport.Core is a code first reporting engine, which is built on top of the iTextSharp.LGPLv2.Core and EPPlus.Core libraries.

.NET library for carefully refactoring critical paths. It's a port of GitHub's Ruby Scientist library.

Assembly scanning extensions for Microsoft.Extensions.DependencyInjection.

A .NET library that makes shelling out commands super easy and fluent.

An extensible replacement for string.Format.

The .NET Standard (.NET Core) version from the System Linq Dynamic functionality.

A set of .NET libraries for Windows implementing PInvoke calls to many native Windows APIs with supporting wrappers.

"health checks" for your applications, resources and infrastructure. Keep your Warden on the watch.

ASP.NET Core Progressive Web Apps.

.NET Standard wrapper for FFmpeg. It allows to process media without know how FFmpeg works, and can be used to pass customized arguments to FFmpeg from C# application.

Ultimate library for extracting metadata and downloading Youtube videos and playlists.

Handy library for computing technical indicators, and it targets to be an automated trading system that provides stock data feeding, indicator computing, strategy building and automatic trading.

Small validation library for .NET that uses a fluent interface and lambda expressions for building validation rules.

Form & Validation Helper for ASP.NET Core. Form Helper helps you to create ajax forms and validations without writing any javascript code. (Compatible with Fluent Validation).

A high-performance, extensible argument validation library.

A dead simple validation for .NET Core. No more if-statements all around your code. Write nice and clean fluent validators instead!

ASP.NET Core Proxies made easy.

Lightweight cURL binding library for C# with support for multiple simultaneous transfers through curl_multi interface.

HttpListener for .NET Core (NETStandard).

A simple to use TCP and UDP networking library for .NET, designed to be flexible, scalable and FAST.

Fully managed, cross platform (Windows, Mac, Linux) .NET library for capturing packets from live and file based devices.

Create advanced Excel spreadsheets using .NET.

.NET library that can read/write Office formats without Microsoft Office installed. No COM+, no interop.

The Open XML SDK provides tools for working with Office Word, Excel, and PowerPoint documents.

Cosmos is an operating system "construction kit". Build your own OS using managed languages such as C#, VB.NET, and more!

A lightweight and high-performance Object/Relational Mapping(ORM) library for .NET.

Familiar developer experience to previous versions of EF, including LINQ, POCO, and Code First support.

EntityFrameworkCore Bulk Batch Extensions for Insert Update Delete Read (CRUD) ops

Use typed Exceptions for EntityFrameworkCore when your SQL query violates database constraints in SqlServer, MySql, or PostgreSQL.

Reactive hot observables of your EF operations.

Trigger events for EF.

Easily get the primary key of any entity (including composite keys).

Get a proxy object of the original values of your entity (typed access to Property("...").OriginalValue).

Classes which auto-magically keep an audit history of the changes to the specified property.

Simple library that can help to sync a large number of records in-memory into the database. Lambda Expression is supported.

A free set of extensions for LINQ to SQL and Entity Framework power users.

Entity Framework Core provider for MySql built on top of mysql-net/MySqlConnector.

A simple query language for Entity Framework Core.

Simple object mapper for .NET.

Provides a simple API to fluently map POCO properties to database columns when using Dapper.

Simple CRUD operations for Dapper.

CRUD for Dapper.

a convenient ORM in dotnet,supports Mysql, Postgresql, SqlServer, Oracle and Sqlite.

Hybrid-ORM, designed to be simple to use and not totally hide SQL, while having all the nice things you expect from an ORM. Inspired by RedBeanPHP.

The fastest LINQ database access library offering a simple, lightweight, fast, and type-safe layer between your POCO objects and your database for more than 10 database engines with full SQL support.

NHibernate Object Relational Mapper.

Persistence library used to abstract different storage implementations when using event sourcing as storage mechanism. This library is developed with a specific focus on DDD/CQRS applications.

Simple microORM that maps the results of a query onto a POCO object. Project based on Schotime's branch of PetaPoco.

Lightweight provider-independent DAL for SQL commands generation, CRUD operations and simple POCO mapping.

A tiny ORM-ish thing for your POCO's.

A hybrid ORM library for .NET.

Light, simple and fast convention-based POCO ORM.

Fast and versatile Micro-ORM.

SmartSql = MyBatis + Cache(Memory | Redis) + ZooKeeper + R/W Splitting +Dynamic Repository ....

Stream Store library targeting SQL based implementations for .NET.

Entity Framework Core provider for PostgreSQL.

EntityFramework Utilities | Bulk Operations | Batch Delete | Batch Update | Query Cache | Query Filter | Query Future | Query Include | Audit.

Reactive hot observables of your EF operations.

Elegant Sql Query Builder, that supports complex queries, joins, sub queries, nested where conditions, vendor engine targets and more

Lightweight, open-source, real-time diagnostics and insights profiler for .NET. Unstable version

A simple but effective mini-profiler for ASP.NET websites.

The open source report generator for .NET Core 2.x/.Net Framework 4.x. FastReport can be used in MVC, Web API applications.

Lightweight robust library for running tasks(jobs) on schedules.

.Net Core meets Laravel: Scheduling, Queuing, etc.

Automated job scheduler with fluent interface.

Easy C# API for Distributed Background Tasks/Jobs for .NET Core. Inspired by celery for python.

Easy way to perform fire-and-forget, delayed and recurring tasks inside ASP.NET apps http://hangfire.io.

Efficient asynchronous and synchronous state machines for .NET.

Crontab for .NET.

Quartz Enterprise Scheduler .NET http://www.quartz-scheduler.net.

Simple library for creating state machines in C# code.

The Amazon Web Services (AWS) .NET Core SDK components. Each AWS service has its own NuGet package.

.NET Standard client library for Azure Event Hubs.

C# .Net wrapper for the Bittrex web API including all features easily accessible and usable.

.Net API wrapper for the Binance web API.

Client for CakeMail's API. Allows you to send transactional emails, bulk emails, manage lists and contacts, etc.

.NET API for Consul.

C# .NET client for the NATS messaging system.

A .NET Standard wrapper for the Dark Sky API.

.NET (C#) Client Library for Docker API.

Firebase Admin .NET SDK

Google Cloud Client Libraries for .NET.

A fully object-oriented .Net wrapper for Trello's RESTful API written in C#.

Lightweight framework to run self hosting REST services using Web Api or NancyFx ontop of a Consul or ETCD cluster.

GitHub API client library for .NET.

Parallel REST Client for ArcGIS Server.

C# client library for using the full SendGrid API.

.NET Standard compatible C# client to interface with Etsy's excellent statsd server.

Intuitive .NET C# library to access the Twitter REST and STREAM API.

Middleware for adding security headers to an ASP.NET Core application.

Cleans HTML to avoid XSS attacks.

Library for processing JOSE objects (JWT, JWA, JWS and related).

Jwt.Net, a JWT (JSON Web Token) implementation for .NET.

A lightweight, dynamic jwt server for ASP.NET Core.

Security libraries for ASP.NET http://www.nwebsec.com.

reCAPTCHA 2.0 for ASP.NET Core.

Roslyn analyzers that aim to help security audit on .NET applications.

.NET Core middleware for injecting the Owasp recommended HTTP Headers for increased security.

Middleware for security and authorization of web apps.

Small package to allow adding security headers to ASP.NET Core websites.

Repository for the official Algolia .NET client.

Repository for both NEST and Elasticsearch.NET, the two official elasticsearch .NET clients.

Elasticsearch .NET API.

Advanced search capabilities for IQueryable interfaces, such as Entity Framework queries.

A Similarity Metric Library, e.g. from edit distance's (Levenshtein, Gotoh, Jaro etc) to other metrics, (e.g Soundex, Chapman)

Simple and lightweight query .NET library for Solr, in a controlled, buildable and fail fast way.

Persistent, simple, powerful and portable autocomplete library.

Serialization for custom packet and protocol formats, supports bit-twiddling.

Cross-platform framework for working with schematized data. It supports cross-language de/serialization and powerful generic mechanisms for efficiently manipulating data. Bond is broadly used at Microsoft in high scale services.

Push based .NET Streams.

Library to help reading and writing CSV files.

EDI Serializer/Deserializer. Supports EDIFact, X12 and TRADACOMS format.

Extended Xml Serializer for .NET.

Fast .NET JSON (De)Serializer, Built On Sigil.

MessagePack implementation for Common Language Infrastructure / msgpack.org.

Extremely Fast MessagePack Serializer for C#(.NET, .NET Core, Unity, Xamarin).

Popular high-performance JSON framework for .NET.

Protocol Buffers library for idiomatic .NET.

Schema.org objects turned into strongly typed C# POCO classes for use in .NET. All classes can be serialized into JSON/JSON-LD and XML, typically used to represent structured data in the head section of html page.

JSON, JSV and CSV Text Serializers.

Easy to use, easy to extend and high-performance library for CSV parsing with .NET.

Binary serializer for POCO objects.

.NET

Fast binary (de)serializer for .NET.

Definitely Fastest and Zero Allocation JSON Serializer for C#(NET, .NET Core, Unity, Xamarin).

XML Serialization Library for the .NET Framework and .NET Core. Extremely flexible and powerful.

.NET Port of Tobias Lütke's Liquid template language.

Open-source .NET template engine that is as close as possible to the Liquid template language.

Portable .NET library for reading/writing xaml files.

Parser and code generator for CSHTML files used in view pages for MVC web apps.

Template engine based on Microsoft's Razor parsing engine for .NET Core.

A fast, powerful, safe and lightweight text templating language and engine for .NET.

Web UI test automation full-featured framework based on Selenium WebDriver. https://atata.io

Simple and sane fake data generator for C#. Based on and ported from the famed faker.js.

BDD framework for xUnit.net

The easy mocking library for .NET.

Set of .NET extension methods that allow you to more naturally specify the expected outcome of a TDD or BDD-style test.

Library you can use to generate realistic test data.

BDD framework allowing to create easy to read and maintain tests.

Testing layer for Microsoft's HttpClient library.

Most popular and friendly mocking framework for .NET.

Popular testing framework for writing BDD-style tests.

Fluent testing framework for ASP.NET Core MVC.