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Robin Asherleft a comment
I use T-Metric to keep track of time spent on different projects for different clients. The system allows me to set Clients, Projects, and even tasks. It senses when there is no activity and asks if this time should be included or not. It is possible to edit each time segment individually. At the end of the month, I can easily see what was done for my billing. And, to my mind, the best part is...

TMetricUser-friendly Time Tracker for freelancers and companies
