pool.ntp.org: The Internet Time Network - Information on a collection of public NTP servers provided by users and ISP's placed in a DNS round-robin under pool.ntp.org
NTP Reference Implementation Mailing Lists - Variety of mailing lists used to support ntp.org, including the announce list, CVS logs, bugs, and questions (which is gatewayed to the USENET newsgroup comp.protocols.time.ntp)