Free Alarm Clock - Free Alarm Clock is a free, full-featured and user-friendly computer alarm clock for Windows.
Clock + - Alarm clock, timer, and stopwatch application for Android
Gnome Clocks - Clock application designed for GNOME 3
Clock Tab - Clock tab allows you to view the time right in your web browser!
AlarmDJ - Online Alarm Clock - Use YouTube videos or MP3 files as alarm sound. Works offline.
Clockwise - Time & attendance tracking with QuickBooks integration