Network Time System is described as 'Time sync software package containing NTP Server and NTP client apps for Windows that provides a precise tool for synchronization of all devices on the network with zero configuration installation' and is an app. There are more than 10 alternatives to Network Time System for Windows and Linux. The best Network Time System alternative is NetTime, which is both free and Open Source. Other great apps like Network Time System 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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