open-source

• sourceforge listing
• Timecult (nope... I like the hierarchical stuff, but it's still too early in its development, too feature-poor)
• Timetool
• Timmon (looks nice, but I'm unable to find the binary distribution to run it... the .zip can be downloaded, but appears to be corrupt ??? )
• TimeTrack (not hierarchical)
• TaskCoach (oooh! very nice!)