iCal Time-Recording is designed for time tracking on tasks. You can create Tasks, finish them and the script outputs a weekly/monthly statistic on those. New in Version 2 is a direct ics-export feature, that makes it easy to use not just in Apple iCal but also in Google Calendar or any other app that supports .ics.
Note: Although Finder indicates no version number for this application, the developer refers to it as version 2.1.
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