Kimai is a free and open source time tracking software which tracks your work time and prints out a summary of your activities on demand.
This time tracking software can be used as a web service or as a standalone software. It is lightweight and works with all major browsers. Kamai is multi-lingual and easily theme-able.
Pingback: Tweets that mention Open Source Time Tracking Software: Kimai | Greepit -- Topsy.com