1)   Atom Time Synchronizer 3.7.9
AtomTime Synchronizer is a useful and handy utility to keep your PC clock accurate. It can periodically check and synchronize your computer time with a NIST atomic time server, or synchronize time between computers, and can also act as a time server

 2)   1st Atomic Time 2.12
1st Atomic Time adjusts your system time with Internet atomic time servers. You can pick the fastest and most reliable servers and adjust the time automatically at regular intervals. 1st Atomic Time can work as a time server for any network.

 3)   Atomic PC Clock 1.2
Atomic PC Clock allows you to make the most of your time! By using Atomic PC Clock, you will not be late for important appointments. Atomic PC Clock's intuitive user interface is ideal for both the novice and expert PC user.