Free Alarm Clock - Free Alarm Clock is a free, full-featured and user-friendly computer alarm clock for Windows.
Caffeine for Mac - Caffeine is a tiny program that puts an icon in the right side of your menu bar.
Gnome Clocks - Clock application designed for GNOME 3
Caffeine for Windows - Prevent your computer from going to sleep
AlarmDJ - Online Alarm Clock - Use YouTube videos or MP3 files as alarm sound. Works offline.
Caffeine for Linux - Inspired by the Mac OS X version, Caffeine for Linux is a status bar application able to...