- Microsoft's Q262680: Simple Network Time Protocol Time Servers
- NIST Internet Time Service : Set Your Computer Clock Via the Internet
- Norman Chang's Time Synchronization page
covers most operating platforms - Dave Central's Time Synchronization page
focuses on freeware / shareware - CNET's Search for Time Synchronization resources
- Yahoo's Time page
- US Time
- USNO Time Service
- Network Time Protocol (NTP) at the University of Michigan
- Q131715: How to Set Up And Synchronize with Domain Time Source Servers
- Q174557: Time Sources Defined For The Windows NT Time Service