PresenTense Time Client NT 

PresenTense is a network time client for Windows NT/2000/XP/2003. It synchronizes your PC system clock to a network time server. Supports e-mail notification, redundancy and and can be remotely managed. Now supports NTP4.0 and NINA.
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Atom Time Synchronizer 

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
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