Curated list of awesome lists
Awesome R
A curated list of awesome R packages and tools. Inspired by awesomemachinelearning.
For better navigation, see https://awesomer.com
2018

r2d3  R Interface to D3 Visualizations

rstatsed  List of courses teaching R

promises  Abstractions for PromiseBased Asynchronous Programming

tinytex  A lightweight and easytomaintain LaTeX distribution

Readings in Applied Data Science  These readings reflect Hadley's personal thoughts about applied data science.
2017

prophet  Tool for producing high quality forecasts for time series data that has multiple seasonality with linear or nonlinear growth.

tidyverse  Easily install and load packages from the tidyverse

purrr  A functional programming toolkit for R

hrbrthemes  🔏 Opinionated, typographiccentric ggplot2 themes and theme components

xaringan  Create HTML5 slides with R Markdown and the JavaScript library

blogdown  Create Blogs and Websites with R Markdown

glue  Glue strings to data in R. Small, fast, dependency free interpreted string literals.

covr  Test coverage reports for R

lintr  Static Code Analysis for R

reprex  Render bits of R code for sharing, e.g., on GitHub or StackOverflow.

reticulate  R Interface to Python

tensorflow  TensorFlow for R

utf8  Manipulating and printing UTF8 text that fixes multiple bugs in R's UTF8 handling.

Patchwork  Combine separate ggplots into the same graphic.
Integrated Development Environments
Integrated Development Environment

RStudio  A powerful and productive user interface for R. Works great on Windows, Mac, and Linux.

Emacs + ESS  Emacs Speaks Statistics is an addon package for emacs text editors.

Sublime Text + RBox  Addon package for Sublime Text 2/3.

TextMate + r.tmblundle  Addon package for TextMate 1/2.

StatET  An Eclipse based IDE for R.

Revolution R Enterprise  Revolution R would be offered free to academic users and commercial software would focus on big data, large scale multiprocessor functionality.

R Commander  A package that provides a basic graphical user interface.

IRkernel  R kernel for Jupyter.

Deducer  A Menu driven data analysis GUI with a spreadsheet like data editor.

Radiant  A platformindependent browserbased interface for business analytics in R, based on the Shiny.

VimR  Vim plugin for R.

NvimR  Neovim plugin for R.

Jamovi and JASP  Desktop software for both Bayesian and Frequentist methods, using a UI familiar to SPSS users.

Bio7  An IDE contains tools for model creation, scientific image analysis and statistical analysis for ecological modelling.

RTVS  R Tools for Visual Studio.

radian (formerly rtichoke)  A modern R console with syntax highlighting.

RKWard  An extensible IDE/GUI for R.
Syntax
Packages change the way you use R.

magrittr  Let's pipe it.

pipeR  Multiparadigm Pipeline Implementation.

lambda.r  Functional programming and simple pattern matching in R.

purrr  A FP package for R in the spirit of underscore.js.
Data Manipulation
Packages for cooking data.

dplyr  Fast data frames manipulation and database query.

data.table  Fast data manipulation in a short and flexible syntax.

reshape2  Flexible rearrange, reshape and aggregate data.

readr  A fast and friendly way to read tabular data into R.

haven  Improved methods to import SPSS, Stata and SAS files in R.

tidyr  Easily tidy data with spread and gather functions.

broom  Convert statistical analysis objects into tidy data frames.

rlist  A toolbox for nontabular data manipulation with lists.

jsonlite  A robust and quick way to parse JSON files in R.

ff  Data structures designed to store large datasets.

lubridate  A set of functions to work with dates and times.

stringi  ICU based string processing package.

stringr  Consistent API for string processing, built on top of stringi.

bigmemory  Shared memory and memorymapped matrices. The big* packages provide additional tools including linear models (biglm) and Random Forests (bigrf).

fuzzyjoin  Join tables together on inexact matching.

tidyverse  Easily install and load packages from the tidyverse.
Graphic Displays
Packages for showing data.

ggplot2  An implementation of the Grammar of Graphics.

ggfortify  A unified interface to ggplot2 popular statistical packages using one line of code.

ggrepel  Repel overlapping text labels away from each other.

ggalt  Extra Coordinate Systems, Geoms and Statistical Transformations for ggplot2.

ggtree  Visualization and annotation of phylogenetic tree.

ggtech  ggplot2 tech themes and scales

ggplot2 Extensions  Showcases of ggplot2 extensions.

lattice  A powerful and elegant highlevel data visualization system.

corrplot  A graphical display of a correlation matrix or general matrix. It also contains some algorithms to do matrix reordering.

rgl  3D visualization device system for R.

Cairo  R graphics device using cairo graphics library for creating highquality display output.

extrafont  Tools for using fonts in R graphics.

showtext  Enable R graphics device to show text using system fonts.

animation  A simple way to produce animated graphics in R, using ImageMagick.

gganimate  Create easy animations with ggplot2.

misc3d  Powerful functions to deal with 3d plots, isosurfaces, etc.

xkcd  Use xkcd style in graphs.

imager  An image processing package based on CImg library to work with images and display them.

hrbrthemes  🔏 Opinionated, typographiccentric ggplot2 themes and theme components.

waffle  🍁 Make waffle (square pie) charts in R.

dendextend  visualizing, adjusting and comparing trees of hierarchical clustering.

r2d3  R Interface to D3 Visualizations

Patchwork  Combine separate ggplots into the same graphic.
Packages for interactive visualizations.

heatmaply  Interactive heatmaps with D3.

d3heatmap  Interactive heatmaps with D3 (no longer maintained).

DataTables  Displays R matrices or data frames as interactive HTML tables.

DiagrammeR  Create JS graph diagrams and flowcharts in R.

dygraphs  Charting timeseries data in R.

formattable  Formattable Data Structures.

ggvis  Interactive grammar of graphics for R.

Leaflet  One of the most popular JavaScript libraries interactive maps.

MetricsGraphics  Enables easy creation of D3 scatterplots, line charts, and histograms.

networkD3  D3 JavaScript Network Graphs from R.

scatterD3  Interactive scatterplots with D3.

plotly  Interactive ggplot2 and Shiny plotting with plot.ly.

rCharts  Interactive JS Charts from R.

rbokeh  R Interface to Bokeh.

threejs  Interactive 3D scatter plots and globes.

timevis  Create fully interactive timeline visualizations.

visNetwork  Using vis.js library for network visualization.

wordcloud2  R interface to wordcloud2.js.

highcharter  R wrapper for highcharts based on htmlwidgets
Reproducible Research
Packages for literate programming and reproducible workflows.

knitr  Easy dynamic report generation in R.

tinytex  A lightweight and easytomaintain LaTeX distribution

xtable  Export tables to LaTeX or HTML.

rapport  An R templating system.

rmarkdown  Dynamic documents for R.

slidify  Generate reproducible html5 slides from R markdown.

Sweave  A package designed to write LaTeX reports using R.

texreg  Formatting statistical models in LaTex and HTML.

checkpoint  Install packages from snapshots on the checkpoint server.

brew  Precompute data to enhance your report templates. Can be combined with knitr.

ReporteRs  An R package to generate Microsoft Word, Microsoft PowerPoint and HTML reports.

bookdown  Authoring Books with R Markdown.

ezknitr  Avoid the typical working directory pain when using 'knitr'

drake  An rOpenSci package for reproducible data science workflows too big for knitr.
Web Technologies and Services
Packages to surf the web.

Web Technologies List  Information about how to use R and the world wide web together.

shiny  Easy interactive web applications with R. See also awesomershiny

shinyjs  Easily improve the user interaction and user experience in your Shiny apps in seconds.

RCurl  General network (HTTP/FTP/...) client interface for R.

curl  A Modern and Flexible Web Client for R.

httr  Userfriendly RCurl wrapper.

httpuv  HTTP and WebSocket server library.

XML  Tools for parsing and generating XML within R.

rvest  Simple web scraping for R, using CSSSelect or XPath syntax.

OpenCPU  HTTP API for R.

Rfacebook  Access to Facebook API via R.

RSiteCatalyst  R client library for the Adobe Analytics.

plumber  A library to expose existing R code as web API.
Parallel Computing
Packages for parallel computing.

parallel  R started with release 2.14.0 which includes a new package parallel incorporating (slightly revised) copies of packages multicore and snow.

Rmpi  Rmpi provides an interface (wrapper) to MPI APIs. It also provides interactive R slave environment.

foreach  Executing the loop in parallel.

future  A minimal, efficient, crossplatform unified Future API for parallel and distributed processing in R; designed for beginners as well as advanced developers.

SparkR  R frontend for Spark.

DistributedR  A scalable highperformance platform from HP Vertica Analytics Team.

ddR  Provides distributed data structures and simplifies distributed computing in R.

sparklyr  R interface for Apache Spark from RStudio.

batchtools  High performance computing with LSF, TORQUE, Slurm, OpenLava, SGE and Docker Swarm.
Packages for making R faster.

Rcpp  Rcpp provides a powerful API on top of R, make function in R extremely faster.

Rcpp11  Rcpp11 is a complete redesign of Rcpp, targetting C++11.

compiler  speeding up your R code using the JIT
Language API
Packages for other languages.

rJava  Lowlevel R to Java interface.

jvmr  Integration of R, Java, and Scala.

rJython  R interface to Python via Jython.

rPython  Package allowing R to call Python.

runr  Run Julia and Bash from R.

RJulia  R package Call Julia.

JuliaCall  Seamless Integration Between R and Julia.

RinRuby  a Ruby library that integrates the R interpreter in Ruby.

R.matlab  Read and write of MAT files together with RtoMATLAB connectivity.

RcppOctave  Seamless Interface to Octave and Matlab.

RSPerl  A bidirectional interface for calling R from Perl and Perl from R.

V8  Embedded JavaScript Engine.

htmlwidgets  Bring the best of JavaScript data visualization to R.

rpy2  Python interface for R.
Database Management
Packages for managing data.

RODBC  ODBC database access for R.

DBI  Defines a common interface between the R and database management systems.

elastic  Wrapper for the Elasticsearch HTTP API

mongolite  Streaming Mongo Client for R

odbc  Connect to ODBC databases (using the DBI interface)

RMariaDB  An R interface to MariaDB (a replacement for the old RMySQL package)

RMySQL  R interface to the MySQL database.

ROracle  OCI based Oracle database interface for R.

RPostgres  an DBIcompliant interface to the postgres database.

RPostgreSQL  R interface to the PostgreSQL database system.

RSQLite  SQLite interface for R

RJDBC  Provides access to databases through the JDBC interface.

rmongodb  R driver for MongoDB.

rredis  Redis client for R.

RCassandra  Direct interface (not Java) to the most basic functionality of Apache Cassandra.

RHive  R extension facilitating distributed computing via Apache Hive.

RNeo4j  Neo4j graph database driver.

rpostgis  R interface to PostGIS database and get spatial objects in R.
Machine Learning
Packages for making R cleverer.

anomalize  Tidy Anomaly Detection using Twitter's AnomalyDetection method.

AnomalyDetection  AnomalyDetection R package from Twitter.

ahaz  Regularization for semiparametric additive hazards regression.

arules  Mining Association Rules and Frequent Itemsets

bigrf  Big Random Forests: Classification and Regression Forests for
Large Data Sets

bigRR  Generalized Ridge Regression (with special advantage for p >> n
cases)

bmrm  Bundle Methods for Regularized Risk Minimization Package

Boruta  A wrapper algorithm for allrelevant feature selection

BreakoutDetection  Breakout Detection via Robust EStatistics from Twitter.

bst  Gradient Boosting

CausalImpact  Causal inference using Bayesian structural timeseries models.

C50  C5.0 Decision Trees and RuleBased Models

caret  Classification and Regression Training

Clever Algorithms For Machine Learning

CORElearn  Classification, regression, feature evaluation and ordinal
evaluation

CoxBoost  Cox models by likelihood based boosting for a single survival
endpoint or competing risks

Cubist  Rule and InstanceBased Regression Modeling

e1071  Misc Functions of the Department of Statistics (e1071), TU Wien

earth  Multivariate Adaptive Regression Spline Models

elasticnet  ElasticNet for Sparse Estimation and Sparse PCA

ElemStatLearn  Data sets, functions and examples from the book: "The Elements
of Statistical Learning, Data Mining, Inference, and
Prediction" by Trevor Hastie, Robert Tibshirani and Jerome
Friedman

evtree  Evolutionary Learning of Globally Optimal Trees

forecast  Timeseries forecasting using ARIMA, ETS, STLM, TBATS, and neural network models

forecastHybrid  Automatic ensemble and cross validation of ARIMA, ETS, STLM, TBATS, and neural network models from the "forecast" package

prophet  Tool for producing high quality forecasts for time series data that has multiple seasonality with linear or nonlinear growth.

FSelector  A feature selection framework, based on subsetsearch or feature ranking approches.

frbs  Fuzzy Rulebased Systems for Classification and Regression Tasks

GAMBoost  Generalized linear and additive models by likelihood based
boosting

gamboostLSS  Boosting Methods for GAMLSS

gbm  Generalized Boosted Regression Models

glmnet  Lasso and elasticnet regularized generalized linear models

glmpath  L1 Regularization Path for Generalized Linear Models and Cox
Proportional Hazards Model

GMMBoost  Likelihoodbased Boosting for Generalized mixed models

grplasso  Fitting user specified models with Group Lasso penalty

grpreg  Regularization paths for regression models with grouped
covariates

h2o  Deeplearning, Random forests, GBM, KMeans, PCA, GLM

hda  Heteroscedastic Discriminant Analysis

ipred  Improved Predictors

kernlab  kernlab: Kernelbased Machine Learning Lab

klaR  Classification and visualization

kohonen  Supervised and Unsupervised SelfOrganising Maps.

L0Learn  Fast algorithms for best subset selection

lars  Least Angle Regression, Lasso and Forward Stagewise

lasso2  L1 constrained estimation aka ‘lasso’

LiblineaR  Linear Predictive Models Based On The Liblinear C/C++ Library

lme4  Mixedeffects models

LogicReg  Logic Regression

maptree  Mapping, pruning, and graphing tree models

mboost  ModelBased Boosting

Machine Learning For Hackers

mlr  Extensible framework for classification, regression, survival analysis and clustering

mvpart  Multivariate partitioning

MXNet  MXNet brings flexible and efficient GPU computing and stateofart deep learning to R.

ncvreg  Regularization paths for SCAD and MCPpenalized regression
models

nnet  eedforward Neural Networks and Multinomial LogLinear Models

oblique.tree  Oblique Trees for Classification Data

pamr  Pam: prediction analysis for microarrays

party  A Laboratory for Recursive Partytioning

partykit  A Toolkit for Recursive Partytioning

penalized  L1 (lasso and fused lasso) and L2 (ridge) penalized estimation
in GLMs and in the Cox model

penalizedLDA  Penalized classification using Fisher's linear discriminant

penalizedSVM  Feature Selection SVM using penalty functions

quantregForest  quantregForest: Quantile Regression Forests

randomForest  randomForest: Breiman and Cutler's random forests for classification and regression.

randomForestSRC  randomForestSRC: Random Forests for Survival, Regression and Classification (RFSRC).

ranger  A Fast Implementation of Random Forests.

rattle  Graphical user interface for data mining in R.

rda  Shrunken Centroids Regularized Discriminant Analysis

rdetools  Relevant Dimension Estimation (RDE) in Feature Spaces

REEMtree  Regression Trees with Random Effects for Longitudinal (Panel)
Data

relaxo  Relaxed Lasso

rgenoud  R version of GENetic Optimization Using Derivatives

rgp  R genetic programming framework

Rmalschains  Continuous Optimization using Memetic Algorithms with Local
Search Chains (MALSChains) in R

rminer  Simpler use of data mining methods (e.g. NN and SVM) in
classification and regression

ROCR  Visualizing the performance of scoring classifiers

RoughSets  Data Analysis Using Rough Set and Fuzzy Rough Set Theories

rpart  Recursive Partitioning and Regression Trees

RPMM  Recursively Partitioned Mixture Model

RSNNS  Neural Networks in R using the Stuttgart Neural Network
Simulator (SNNS)

Rsomoclu  Parallel implementation of selforganizing maps.

RWeka  R/Weka interface

RXshrink  RXshrink: Maximum Likelihood Shrinkage via Generalized Ridge or Least
Angle Regression

sda  Shrinkage Discriminant Analysis and CAT Score Variable Selection

SDDA  Stepwise Diagonal Discriminant Analysis

SuperLearner and subsemble  Multialgorithm ensemble learning packages.

svmpath  svmpath: the SVM Path algorithm

tgp  Bayesian treed Gaussian process models

tree  Classification and regression trees

varSelRF  Variable selection using random forests

xgboost  eXtreme Gradient Boosting Tree model, well known for its speed and performance.
Natural Language Processing
Packages for Natural Language Processing.

text2vec  Fast Text Mining Framework for Vectorization and Word Embeddings.

tm  A comprehensive text mining framework for R.

openNLP  Apache OpenNLP Tools Interface.

koRpus  An R Package for Text Analysis.

zipfR  Statistical models for word frequency distributions.

NLP  Basic functions for Natural Language Processing.

LDAvis  Interactive visualization of topic models.

topicmodels  Topic modeling interface to the C code developed by by David M. Blei for Topic Modeling (Latent Dirichlet Allocation (LDA), and Correlated Topics Models (CTM)).

syuzhet  Extracts sentiment from text using three different sentiment dictionaries.

SnowballC  Snowball stemmers based on the C libstemmer UTF8 library.

quanteda  R functions for Quantitative Analysis of Textual Data.

Topic Models Resources  Topic Models learning and R related resources.

NLP for  NLP related resources in R. @Chinese

MonkeyLearn  🐒 R package for text analysis with Monkeylearn 🐒.

tidytext  Implementing tidy principles of Hadley Wickham to text mining.

utf8  Manipulating and printing UTF8 text that fixes multiple bugs in R's UTF8 handling.
Bayesian
Packages for Bayesian Inference.

coda  Output analysis and diagnostics for MCMC.

mcmc  Markov Chain Monte Carlo.

MCMCpack  Markov chain Monte Carlo (MCMC) Package.

R2WinBUGS  Running WinBUGS and OpenBUGS from R / SPLUS.

BRugs  R interface to the OpenBUGS MCMC software.

rjags  R interface to the JAGS MCMC library.

rstan  R interface to the Stan MCMC software.
Optimization
Packages for Optimization.

lpSolve  Interface to
Lp_solve
to Solve Linear/Integer Programs.

minqa  Derivativefree optimization algorithms by quadratic approximation.

nloptr  NLopt is a free/opensource library for nonlinear optimization.

ompr  Model mixed integer linear programs in an algebraic way directly in R.

Rglpk  R/GNU Linear Programming Kit Interface

ROI  The R Optimization Infrastructure ('ROI') is a sophisticated framework for handling optimization problems in R.
Finance
Packages for dealing with money.

quantmod  Quantitative Financial Modelling & Trading Framework for R.

TTR  Functions and data to construct technical trading rules with R.

PerformanceAnalytics  Econometric tools for performance and risk analysis.

zoo  S3 Infrastructure for Regular and Irregular Time Series.

xts  eXtensible Time Series.

tseries  Time series analysis and computational finance.

fAssets  Analysing and Modelling Financial Assets.
Packages for processing biological datasets.

Bioconductor  Tools for the analysis and comprehension of highthroughput genomic data.

genetics  Classes and methods for handling genetic data.

gap  An integrated package for genetic data analysis of both population and family data.

ape  Analyses of Phylogenetics and Evolution.

pheatmap  Pretty heatmaps made easy.
Network Analysis
Packages to construct, analyze and visualize network data.

Network Analysis List  Network Analysis related resources.

igraph  A collection of network analysis tools.

network  Basic tools to manipulate relational data in R.

sna  Basic network measures and visualization tools.

netdiffuseR  Tools for Analysis of Network Diffusion.

networkDynamic  Support for dynamic, (inter)temporal networks.

ndtv  Tools to construct animated visualizations of dynamic network data in various formats.

statnet  The project behind many R network analysis packages.

ergm  Exponential random graph models in R.

latentnet  Latent position and cluster models for network objects.

tnet  Network measures for weighted, twomode and longitudinal networks.

rgexf  Export network objects from R to GEXF, for manipulation with network software like Gephi or Sigma.

visNetwork  Using vis.js library for network visualization.
Spatial
Packages to explore the earth.

CRAN Task View: Analysis of Spatial Data Spatial Analysis related resources.

Leaflet  One of the most popular JavaScript libraries interactive maps.

ggmap  Plotting maps in R with ggplot2.

REmap  R interface to the JavaScript library ECharts for interactive map data visualization.

sf  Improved Classes and Methods for Spatial Data.

sp  Classes and Methods for Spatial Data.

rgeos  Interface to Geometry Engine  Open Source

rgdal  Bindings for the Geospatial Data Abstraction Library

maptools  Tools for Reading and Handling Spatial Objects

gstat  Spatial and spatiotemporal geostatistical modelling, prediction and simulation.

spacetime  R classes and methods for spatiotemporal data.

RColorBrewer  Provides color schemes for maps

spatstat  Spatial Point Pattern Analysis, ModelFitting, Simulation, Tests

spdep  Spatial Dependence: Weighting Schemes, Statistics and Models

tigris  Download and use Census TIGER/Line shapefiles in R
R Development
Packages for packages.

Package Development List  R packages to improve package development.

promises  Abstractions for PromiseBased Asynchronous Programming

devtools  Tools to make an R developer's life easier.

testthat  An R package to make testing fun.

R6  simpler, faster, lighterweight alternative to R's builtin classes.

pryr  Make it easier to understand what's going on in R.

roxygen  Describe your functions in comments next to their definitions.

lineprof  Visualise line profiling results in R.

packrat  Make your R projects more isolated, portable, and reproducible.

installr  Functions for installing softwares from within R (for Windows).

import  An import mechanism for R.

modules  An alternative (Python style) module system for R.

Rocker  R configurations for Docker.

RStudio Addins  List of RStudio addins.

drat  Creation and use of R repositories on GitHub or other repos.

covr  Test coverage for your R package and (optionally) upload the results to coveralls or codecov.

lintr  Static code analysis for R to enforce code style.

staticdocs  Generate static html documentation for an R package.

sinew  Generate roxygen2 skeletons populated with information scraped from the function script.
Logging
Packages for Logging

futile.logger  A logging package in R similar to log4j

log4r  A log4j derivative for R

logging  A logging package emulating the python logging package.
Data Packages
Handy Data Packages

engsoccerdata  English and European soccer results 18712016.

gapminder  Excerpt from the Gapminder dataset (data about countries through the past 50 years).
Handy Tools for R

git2r  Gives you programmatic access to Git repositories from R.
Other Interpreters
Alternative R engines.

CXXR  Refactorising R into C++.

fastR  FastR is an implementation of the R Language in Java atop Truffle and Graal.

pqR  a "pretty quick" implementation of R

renjin  a JVMbased interpreter for R.

rho  Refactor the interpreter of the R language into a fullycompatible, efficient, VM for R.

riposte  a fast interpreter and JIT for R.

TERR  TIBCO Enterprise Runtime for R.
Learning R
Packages for Learning R.

swirl  An interactive R tutorial directly in your R console.

DataScienceR  a list of R tutorials for Data Science, NLP and Machine Learning.
Resources
Where to discover new Resources.
Websites

Rproject  The R Project for Statistical Computing.

R Weekly  Weekly updates about R and Data Science. R Weekly is openly developed on GitHub.

R Bloggers  There are people scattered across the Web who blog about R. This is simply an aggregator of many of those feeds.

QuickR  An excellent quick reference.

Advanced R  An online version of the Advanced R book.

Efficient R Programming  An online home of the O’Reilly book: Efficient R Programming.

CRAN Task Views  Task Views for CRAN packages.

The R Programming Wikibook  A collaborative handbook for R.

Rusers  A job board for R users (and the people who are looking to hire them)

R Cookbook  A problemoriented website that supports the R Graphics Cookbook.

tryR  A quick course for getting started with R.

RDocumentation  Search through all CRAN, Bioconductor, GitHub packages and their archives with RDocumentation.
Books

Readings in Applied Data Science  These readings reflect Hadley's personal thoughts about applied data science.

R Books List  List of R Books.

The Art of R Programming  It's a good resource for systematically learning fundamentals such as types of objects, control statements, variable scope, classes and debugging in R.

Free Books  CRAN Contributed Documentation in many languages.

R Cookbook  A quick and simple introduction to conducting many common statistical tasks with R.
 Books written as part of the Johns Hopkins Data Science Specialization:

R Packages  A book (in paper and website formats) on writing R packages.

R in Action  This book aims at all levels of users, with sections for beginning, intermediate and advanced R ranging from "Exploring R data structures" to running regressions and conducting factor analyses.

Use R!  This series of inexpensive and focused books from Springer publish shorter books aimed at practitioners. Books can discuss the use of R in a particular subject area, such as Bayesian networks, ggplot2 and Rcpp.

R for SAS and SPSS users  An excellent resource for users already familiar with SAS or SPSS.

An Introduction to R  A very good introductory text on R, also covers some advanced topics.

Introduction to Statistical Learning with Application in R  A simplified and "operational" version of The Elements of Statistical Learning. Free softcopy provided by its authors.

The R Inferno  Patrick Burns gives insight into R's ins and outs along with its quirks!

R for Data Science  Free book from RStudio developers with emphasis on data science workflow.

Learning R Programming  Learning R as a programming language from basics to advanced topics.
Podcasts
Reference Cards
MOOCs
Massive open online courses.
Lists
Great resources for learning domain knowledge.
Other Awesome Lists
Contributing
Your contributions are always welcome!
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