Free Alarm Clock - Free Alarm Clock is a free, full-featured and user-friendly computer alarm clock for Windows.
SleepBot - SleepBot is a sleep tracking app available in Google Play and the Apple App Store.
Gnome Clocks - Clock application designed for GNOME 3
Sleep Cycle - Bio-alarm clock that wakes you up at optimal times based on your sleep patterns.
Digital Clock 4 - Beautiful customizable clock with plugins
Puzzle Alarm Clock - Puzzle Alarm Clock is an Android-based application which gives a very different sleep monitoring services and an alarm clock module that works according to the user’s requirement.