Rails3-demos is a project mainly written in RUBY and JAVASCRIPT, it's free.
Rails3 Demo application
This project aims to show Rails3 simplicity and awesomeness by providing simple and small demos within one application. Let's teach the newbies and inspire the best hackers.
Currently available demos:
Feel free to fork, add demos and send pull requests.
Visit http://rails3demos.heroku.com/ for live application. Visit http://github.com/paneq/rails3-demos to view the source code.