SleepBot - SleepBot is a sleep tracking app available in Google Play and the Apple App Store.
Hourglass - Hourglass is the most advanced simple countdown timer for Windows.
Sleep Cycle - Bio-alarm clock that wakes you up at optimal times based on your sleep patterns.
Alinof Timer - Alinof Timer is a very easy to use timer for your Mac.
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.
CookTimer - CookTimer is a simple cross-platform countdown timer that helps when cooking, making tea or eggs.