Shutdown Archive web server
Chrony Home Page: www.rrbcurnow.freeuk.com/chrony/releases.html
List of NTP Servers: www.eecis.udel.edu/~mills/ntp/servers.htm
NIST Time and Frequency Division: www.boulder.nist.gov/timefreq
NTP Home Page: www.eecis.udel.edu/~ntp