Hobo: A Rapid Web App Builder for Rails
This screencast demonstrates basic usage of really, really, really cool application builder named Hobo.
You may have thought Ruby on Rails was enough to get Web applications developed quickly, but enter Hobo. Hobo makes the process of creating Web applications and prototypes even quicker. For example, out of the box, with no lines of code written, you get a dummy app with a user signup, login, and authentication system.