Tool: JUnit
Purpose: Automated testing
Version covered: 3.8.1
Home page: http://junit.sourceforge.net/
License: CPL (Common Public License)
Further Reading:
http://www.junit.org/ A very comprehensive site on using JUnit.
http://www.extremeprogramming.org/ Information about extreme programming, one cornerstone of which is automated testing.
There is a very active and useful mailing list that can be joined at http://groups.yahoo.com/group/junit/.