This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
JUnit is the base for almost all of the unit testing tools mentioned here (which are called "extensions" to JUnit). It's not any better than any of the extensions--they're simply built for different purposes.