Free Alarm Clock - Free Alarm Clock is a free, full-featured and user-friendly computer alarm clock for Windows.
NetTime - nettime is a time & attendance software solution.
Gnome Clocks - Clock application designed for GNOME 3
Chrony - Chrony is a pair of programs which are used to maintain the accuracy of the system clock on a...
AlarmDJ - Online Alarm Clock - Use YouTube videos or MP3 files as alarm sound. Works offline.
Dimension 4 - The fastest and easiest way to synchronize your Windows clock.