Sleep Cycle - Bio-alarm clock that wakes you up at optimal times based on your sleep patterns.
ClocX - ClocX - freeware analog clock for Windows desktop with many features like calendar, alarms, skins, antialiasing and transparency.
SleepBot - SleepBot is a sleep tracking app available in Google Play and the Apple App Store.
LClock - Longhorn systray clock program
Online Alarm Clock - The world's original online alarm clock, established in 2006.
DS Clock - Keep your time synchronized with Atomic Time servers, using customizable digital desktop clock with westminster chimes.