PresenTense Time Server 

High performance Windows time server supporting NTP and SNTP protocols. Installation automatically configures default time servers so you have an operational time server in 30 seconds. GPS clock drivers are included.
time server ntp sntp ntp4.0 network time management

PresenTense NTP Auditor 

PresenTense NTP Auditor monitors your computer's built-in clock and compares it's time to the real time. PresenTense NTP Auditor can save logs for days, months and years so you can PROVE what time your computer had at any given point.
sntp ntp ntp4.0 ntp40 atomic clock time server gps gps clock accurate accurate network time exact time synchronize synchronize time