Simple and useful time tracker. Collects tasks and works (timeslots) in hierarchical tree. Has: reports (based on xslt templates), localization (7 langs), xml data format, ical, jnlp and JIRA (R) support. Runs on Windows, Mac and Linux.
The code at GitHub: https://github.com/TimeSlotTracker/timeslottracker-desktop
The git on Source forge is read only (replica).