Sleep Cycle - Bio-alarm clock that wakes you up at optimal times based on your sleep patterns.
Alarmy - World's most annoying alarm app
SleepBot - SleepBot is a sleep tracking app available in Google Play and the Apple App Store.
Galarm - Social alarm clock and reminders
Sleep Time - Alarm Clock - Sleep Time provides insight into your sleep patterns. By tracking your level of movement throughout the night, Sleep Time generates customized sleep data in easy-to-read charts.
Free Alarm Clock - Free Alarm Clock is a free, full-featured and user-friendly computer alarm clock for Windows.