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NTPsec is a secure and hardened NTP implementation with improved security features.
Chrony is a versatile implementation of the Network Time Protocol (NTP). It can synchronize the system clock with NTP servers, reference clocks...
Meinberg NTP is a high-quality and reliable Network Time Protocol (NTP) server and client software.
Free and paid versions available
Leap Second is a software tool that helps manage leap seconds in timekeeping systems.
OpenNTPD is a free, easy-to-use implementation of the Network Time Protocol. It focuses on simplicity and security.
PTPd is an implementation of the Precision Time Protocol (PTP) for accurate time synchronization.
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