Before the work project that required it dried up, we had a quick look at PHPSurveyor. http://phpsurveyor.sourceforge.net/index.phpOr if you really want open source, I see I've bookmarked
http://socrates-qe.sourceforge.net/ but never used it.
Looks a bit complicated. Tomcat is mentioned for one :)
thanks for the link though, saves me a google!
Oh, and it only requires PHP & MySQL.
Cheers,
Matt