The JUnit example project is based on a realistic software development project whose goal is to deliver JUnit Version 4.4. The JUnit Project team uses Rational Team Concert to plan, track, collaborate, and deliver the release. The project is set up in such a way that the Team Artifacts view gives you a feeling that the project is already started with many releases, builds, and work items.
Rational Team Concert lets you play with and explore the complete product from a hosted installation called Sandbox. This is a very convenient way for many who want to explore Rational Team Concert without worrying about installing and configuring.