R -Fiddle is a free and powerful tool to write, run and share R-code inside your browser. Include packages to really run R in the cloud.
R in the Cloud: R-Fiddle, an Online Playground for R code
DataMind is the first free online Interactive Learning Platform for R. Through an in-browser coding environment you can learn R by doing.
Building DataMind: FREE Online Interactive Learning Platform for R
Search R documentation and manuals instantly with the help of RDocumentation.
Search R Documentation and Manuals with Rdocumentation
This post summarizes and discusses the results of DataCamp's survey on “R and education”.