At long last, SPIKE is once again allowed to be public. This is the fuzzer creation kit I wrote that finds the .HTR and ISAPI overflow vulnerabilities discussed here: http://www.microsoft.com/technet/treeview/default.asp?url=/technet/security/bulletin/MS02-018.asp and here: http://www.atstake.com/research/advisories (The Microsoft advisory currently misattributes this vulnerability to Chris Wysopal instead of me :<.)
Anyways, the new SPIKE is available (in source code form only) from spike.sourceforge.net, as is the rather extensive Changelog. It's pretty useful for generic web app auditing as well now.
Yes, SPIKE is still GPL.