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I wrote mine, but I track tasks and milestones rather than time spent.

Time tracking makes sense for freelancers and other people who bill by the hour but personally I tried rescuetime & co. and I do not see the point in knowing how long I was on facebook or how long I spent editing a particular file.

Milestones require manual input but I find that information much more relevant.

I have tried various solutions and finally decided on this one: https://github.com/samg/timetrap

Not free, but I use Klok (http://www.getklok.com/) and enjoy it

If you're using git: https://github.com/timeglass/glass