Active Timer keeps track of the amount of time you spend in each application. This is perfect for automating the process of keeping track of time spent on a project. You can easily sum up the times of mulitple apps, and it saves your time on quit. It also allows for saving a current time to a file, and opening it back up later.
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Menu item to view times
Organize timers into projects
Freeze timed items so they can be tracked separately