NTPmon is a utility which is designed to monitor and display essential health metrics for NTP (Network Time Protocol) servers.  Accurate time is essential to maintaining a functional network, and NTPmon is designed to help you work out whether your NTP servers are, in fact, doing what they're supposed to and keeping accurate time.

NTPmon is Free Software, released under the GNU General Public License, version 3, or (at your option) any later version.  Download the latest version from the last link below.