FitNesse: http://www.fitnesse.org/
Fit: http://fit.c2.com/

Trinidad (Run FitNesse tests from JUnit during a build): http://www.fitnesse.info/trinidad

FitNesse and Selenium Integration: http://xircles.codehaus.org/projects/fitnesse-web

Fit Book: http://www.amazon.com/exec/obidos/tg/detail/-/0321269349/qid=1120782273/sr=8-1/ref=pd_bbs_ur_1/002-3880500-9913639?v=glance&s=books&n=507846

WYSWIG FitNesse Editor: http://richnesse.wiki.sourceforge.net/

FitLibrary: Fixtures: http://sourceforge.net/projects/fitlibrary/

Subversion and FitNesse together: http://www.yoda.arachsys.com/java/fitnesse/

FitNium, Selenium and FitNesse combined: http://www.magneticreason.com/tools/fitnium/fitnium.html

FitNesse Maven plugin: http://mojo.codehaus.org/fitnesse-maven-plugin/

FitNesse Generic Fixture: http://anubhavas.blogspot.com/2008/01/introducing-generic-fixture-for.html