Evaluation of Project Management Tools

In early 2003 I wondered whether there are tools that can help me measure the time spend on tasks.

Task Timing

Current facit: I prefer GTimer over gtt for three reasons: Stability, simple weekly reports and opportunity to quickly add or substract short amounts of time (you never are so perfect to always switch a task on or off when starting or finishing).
Also, I prefer GTimer over PTimeTracker: Easier correcting of the time, more clear switching between tasks and in general a more conforable GUI. PTimeTracker is very stable and therefore I would prefer it over gtt.

GTimer

GTimer is a currently (20-Jan-2003) unmaintained project since March 2000. It is sufficient to log time worked on various projects.
Negative: weekly reports range from Sunday to Saturday, but I need calendar weeks as usual at least in Germany: Monday-Sunday. Also, if you run gtimer twice (eg. on different machines of the same network), there is no mechanism to prevent mutual overwriting of the timed data. Finally, though the storage format is text-based, the timing data are not really human readable since they are in seconds. A format like hh:mm:ss would be better to let users correct data manually if necessary.
Tested version: 1.1.5, Debian package. Test period: three weeks.

gtt

gtt is the now outdated predecessor of GnoTime. It it tested because GnoTime is not available as Debian package for stable or testing.
Negative: Crashes occasionally. No auto-save. No easy way to add/substract some time. Inactivity-mode stops timer without opportunity to add the whole time since inactivity. Stored dataformat is xml, but virtually it is impossible to change the time ranges manually (given as begin/end seconds-since-something). There is absolutely no simple way to obtain daily or weekly reports - you have to implement your own analysis tool. Same problem as gtimer regarding mutual overwriting through multiple instances. Log file does not work.
Tested version: 1.4.1.2, Debian package. Test period: two weeks.

PTimeTracker

PTimeTracker is a qt-2 based utility. It is comparable to GTimer, but with less sophisticated GUI. The project seems to be unmaintained since summer 2000.
Negative: Not hot-keys to correct timing. Same problem with mutual overwriting. Less clear interface to indicate and mange the currently worked on task.
Positive: Unlike GTimer, PTimeTracker supports ISO-Weeks for reports.
Tested version: 1.6.0, compiled tar-ball. Test period: one week.