R-Fiddle is a great tool to develop and test  code segments or complete R programs.   By accessing the R-Fiddle web site users have a fully functioning R console,  code editor and discussion board all in one place.  If a user has code uploaded that has been designated to share,  other users can access the code and make suggestions or additions.  Code can be run with full R support from your web browser.

Try the link below to test out R-Fiddle.  I have uploaded a small program as a demo.  Feel free to share your own projects,  help others or try out code segments.

http://www.r-fiddle.org/#/embed?id=rtOt8yR3

Click in the link above to activate the R editor and R console.