Gnome Clocks - Clock application designed for GNOME 3
Running by Gyroscope - Collect and share your favorite runs — with maps, photos, calories, and other stats.
Digital Clock 4 - Beautiful customizable clock with plugins
Enough Sleep - Boost your performance by getting enough sleep!
AlarmDJ - Online Alarm Clock - Use YouTube videos or MP3 files as alarm sound. Works offline.
Pzizz - Sleep at the push of a button! Now with "Focus"