NetTime - nettime is a time & attendance software solution.
Free Alarm Clock - Free Alarm Clock is a free, full-featured and user-friendly computer alarm clock for Windows.
Meinberg NTP - NTP client and server download for different operating systems.
Digital Clock 4 - Beautiful customizable clock with plugins
Atomic Clock Sync - download the free atomic clock sync config utility to optimize how your Windows pc receives updates from time servers
AlarmDJ - Online Alarm Clock - Use YouTube videos or MP3 files as alarm sound. Works offline.