Curated list of awesome lists
Awesome Building Blocks for Web Apps 
Curated list of standalone features to be integrated into web applications: Get full features built by others instead of having to write everything yourself.
If you like these building blocks, check out componently.com, a marketplace where developers can search, compare and integrate web application building blocks.
Contents
- UI Elements
- Exit Intent Popup
- Auth
- Booking
- Notification
- Social
- Chat Bot
- Chat
- Monitoring
- Content Management
- Consent Management
- Media
- Form
- Marketing
- Changelog
- Telecommunication
- Social Media
- Search
- Feature flags
- Reviews
- Related awesome-lists
UI Elements
- Tailwind UI - UI components, by the creators of Tailwind CSS.
- Webix - JavaScript UI library and framework for displaying data in different ways.
- Highcharts - Interactive charts for web.
- Webatoms - JavaScript bridge for Xamarin.Forms.
- Creative Tim - Themes for React, Angular, Vue, Lavarel and HTML5.
- Syncfusion - Data visualization components and PDF Viewer.
- CoreUI - Vue admin template.
- UIfort - UI design systems for all major frontend frameworks.
- Semantic UI - Open source UI component library for React, Meteor, Ember and Angular.
- Design Revision's Shards Pro - Design blocks for web or mobile apps.
- Themesberg - Bootstrap templates, themes and UI kits.
- Treact - React templates for landing pages, built on Tailwind CSS.
- Creative Designs Guru - Themes for React, Nextjs and Eleventy, built with Tailwind CSS.
Exit Intent Popup
- Wisepops - Contextual popups, banners and bars for mobile and desktop visitors.
- Listagram - Interactive opt-in form for collecting email addresses.
- Poptin - Popups and forms that can be integrated anywhere in the website.
- Embedery - Popups to engage visitors.
Auth
- Auth0 - Authentication management with native support for Angular, React and VueJS.
- Clerk – Complete user management UIs and APIs, purpose-built for React, Next.js, and the modern web.
- Firebase - PaaS from Google, including authentication management.
- Okta - Authentication and Authorization solution with support for Angular, React and VueJS.
- Onelogin - Authentication focussed on company internal applications.
- Microsoft Azure Active Directory - Authentication management in Azure, based on Microsoft accounts.
- AWS Cognito - AWS authentication management. Frontend integration is part of AWS Amplify.
Booking
- Calendly - Stand-alone booking solution.
- Zoho Bookings - Online scheduler integrated into Zoho Suite.
- Acuity Scheduling - Appointment scheduling with extensive API.
- 10to8 - Booking tool with many features in the free tier.
- SuperSaaS - Appointment scheduling with focus on group scheduling.
- SimplyBook.Me - Booking tool with its own booking directory.
- OnceHub - Scheduling via ScheduleOnce and meeting management via InviteOnce.
- YouCanBookMe - Online scheduling for teams.
- OnSched - Scheduling API for marketplaces & applications.
- AppointmentPlus - Appointment scheduling with coupons.
- Booxi - Booking and online directory components.
- Cogsworth Scheduler - Online Scheduler for business with a powerful API.
Notification
- OneSignal - Mobile and web notifications.
- Notific - Notifications including a PHP SDK.
- WonderPush - Notifications focused on speed.
- VWO Engage - Notifications as part of a larger marketing suite.
- Signalize - Free notifications with paid analytics add on.
Social
- Stream - Activity feed & chat APIs.
- EmbedSocial's embedfeed - Social media aggregator.
Chat Bot
- Fresh chat - Chatbot in Freshworks support suite.
- Tiledesh - AI-powered live chat.
Chat
- Daily.co - Video chat.
Monitoring
- Sentry - Full-stack error monitoring with release management included.
- Raygun Crash Reporting - Error monitoring as part of the Raygun suite.
- Honeybadger - Error, uptime and check-in monitoring.
- Rollbar - Error monitoring with the ability to replay HTTP requests that caused errors.
Content Management
- Contentful - Headless content management system.
Consent Management
- Cookiefirst - Cookie consent manager.
- usercentrics - Compliance manager that can be implemented as part of existing pages.
- Sourcepoint - Compliance management as part of a suite including also ad blocker recovery.
- PiwikPro - Compliance management as part of an analytics tool.
- Consent Management Provider - German management tool for Cookie Consent.
- UniConsent - Consent management platform for GDPR, CCPA, COPPA compliance.
- TrustArc - Privacy management for the CCPA, GDPR, LGPD and 900+ other global regulations.
- Cookiebot - Cookie tracking manager.
- iubenda - Consent management and terms and conditions generator.
- Civic Cookie Control - Smaller Cookie and GDPR compliance product.
- CCM19 - German cookie consent manager.
- CookieInformation - Focus on compliance reporting via a dashboard.
- CookiePro - Cookie management as part of a privacy management solution.
- React Cookie Consent - A small and customizable cookie consent bar for React applications.
- React Cookie Banner - React cookie banner which can be automatically dismissed with a scroll.
Media
- Mux - Stream hosted and live videos.
- Spotify web playback SDK - Client-side JavaScript library which allows you to create a new player in Spotify Connect and play any audio track from Spotify in the browser via encrypted media extensions.
Form
- Static Forms - Form that sends its results to your email.
- FlyingForms - Building, versioning and managing forms.
Marketing
- TrustPulse - Shows recent buyers on your website.
Changelog
- Beamer - Combination of push notifications and changelog management.
- Changelogfy - A product release notes tool.
- Changefeed - Changelog as stand-alone page or embeddable widget.
- Canny's Changelog - Combines changelog with product roadmaps.
- ProductFlare's Changelog - Changelog widget around a product team task management system.
- Changes - Changelog building kit.
Telecommunication
- Vonage - Voice, messaging, video and data capabilities across unified communications, contact centers and communications APIs.
Social Media
- AddThis - Social sharing buttons, available on AMPs.
- ShareThis - Social sharing buttons.
- AddToAny - Sharing buttons for many different target services.
Search
Feature flags
- Optimizely's Rollouts - Feature flags combined with A/B testing.
- LaunchDarkly - Feature management with multiple integrations in CI servers and ticketing systems.
- Split - Another feature management with multiple integrations in CI servers and ticketing systems.
- Rollout - Feature management focusing on segmented roll-out of features.
Reviews
- JustReview - Collect reviews from e-commerce, social media and review service providers and embed on a website.
- ReviewsOnMyWebsite - Collect, monitor and display customer reviews.