I'm looking for a good, preferably free, test planning and documentation tool. Ideally something that will keep track of which tests have been run against which software version, with reporting ability. There's a whole bunch of tools listed here but are there any others, and which ones have you had the best experience with? (You do run tests, right?)
UPDATE 2008-01-29
So far TestLink and Fitness have been mentioned. A related question yielded also a link to the ReadySet project, an open collection of software planning documentation templates.
I have used TestLink and found it okayish, but I cannot say I enjoyed using it. Has anyone had any experience with Fitnesse? Or are there any other free tools out there that you have used and found satisfactory?
I've used QualityCenter/TestDirectory for a long time.
I'm now using testlink and I must say that I prefer QualityCenter/TestDirectory by far, even if it based on some buggy ActiveX control.
QualityCenter/TestDirectory is more easier to use and the interface is quite better.
TestLink and QualityCenter/TestDirectory are mainly for manual test case (however, you can use Quick Test Pro on QualityCenter/TestDirectory to automatize your tests).
Fitnesse is another kind of tool in my mind : basically, you write your test case on a wiki and link that to a JUnit test. Another tools like that are GreenPepper, Concordion, etc.