NetTime - nettime is a time & attendance software solution.
TIMEBOX - An advanced timer for professional meeting facilitators
Chrony - Chrony is a pair of programs which are used to maintain the accuracy of the system clock on a...
Hourglass - Hourglass is the most advanced simple countdown timer for Windows.
Dimension 4 - The fastest and easiest way to synchronize your Windows clock.
MetaClock.com - MetaClock is an Online Alarm Clock that can play YouTube videos and uploaded MP3s as an alarm tune. It supports Chromecast which means you can turn your TV or stereo system into an alarm clock. No installation is needed, it can also work offline.