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http://www.neuber.com/free/pctime/index.html
The basic version of PC On/Off Time is freeware. But you can only see the last 3 weeks of your working time. On multiple request there are two extended versions now:
Pro Version  ($9)
- time unlimited chart of working time on a local computer 
 - Month overview instead of 3 weeks overview 
 - automatic backup restores deleted events 
 - correct daylight time 
 - no nag screens
 
Net Version  ($39)
- time unlimited chart of working time on all computer in a network.
(PC On/Off Time only need to install on one computer) 
 - Month overview instead of 3 weeks overview 
 - automatic backup restores deleted events 
 - correct daylight time 
 - no nag screens