Login_example is a project mainly written in JavaScript, it's free.
This is a simple application that was built for the Introduction to Sproutcore traning series put on by Strobe. It is expected to be running on Sproutcore 1.6.
The application depends on a backend rails client simulates a real login service. You can find the backend here. You can find the video of this training here. First use the rails console to add a user, start the rails server, then run sc-server and goto http://localhost:4020/login_example.