Timer is an open-source android app which puts a stopwatch, countdown timer, and world clock viewer onto your android phone. Vanilla android lacks this basic functionality - this app aims to fill this gap with a simple and intuitive interface, using standard android UI widgets and libraries, the way it should have been done in the first place.
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Want to crack it open and make it better? Fork it on github at https://github.com/dpadgett/Timer.