AboutTime is described as 'Superior source of time for your computer. As a time client, it will acquire time from the Internet with great accuracy, and as a server it will provide four kinds of time signals to other computers on your local network' and is an app. There are more than 10 alternatives to AboutTime for Windows and Linux. The best AboutTime alternative is NetTime, which is both free and Open Source. Other great apps like AboutTime are Time-Sync, Chrony, Atomic Clock Time Synchronizer and Network Time Protocol daemon.
Atomic Clock Sync utility can help you optimize how often Windows references an atomic clock server, such as the atomic clock servers operated by the National Institute of Standards and Technology (NIST) in the United States.
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