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.