Pure Java NTP server.
Run as root/admin in cmd-mode without cmd argument, for example:
java -jar pj-ntp-server.jar (server start on standart UDP/123-port)
or run as root/admin in cmd-mode with UDP-port cmd argument, for example:
java -jar pj-ntp-server.jar 1111
where 1111=udp-port of server listen.
Need JRE-1.8. Source = https://github.com/harp077/pj-ntp-server
If you like this - put a star on https://github.com/harp077/pj-ntp-server/ for support project please.