PresenTense Time Server 4.1 is a Server Utility product from bytefusion.com, get 5 Stars SoftSea Rating, PresenTense Time Server delivers industrial grade network time synchronization with microsecond accuracy. It runs as a network time server with support for secure NTP version 3 and 4, SNTP and Unix-Time and offers features like user-level security and email-based error notification and more.
In addition, PresenTense offers hardware clock support for generic satellite clocks via the NMEA 0183 protocol, WWVB radio clocks and DCF77 radio clocks. The installation includes drivers for GPS clocks from Arbiter Systems, Spectracom, Hopf and Ultralink as well as Garmin III Plus and Garmin 5. Additional features include a NTP key generator, NTP troubleshooting software, failover redundancy, NT service support, remote administration and more.
PresenTense Time Server is an RFC standard multi protocol windows time server supporting the NTP4 and SNTP standards. You can use PresenTense Time Server to synchronize your PC to a primary time source such as an atomic clock on the internet or an inhouse GPS reciever and offer time services to clients on your local area network. Most leading GPS and Radio hardware clocks are supported via the serial port. Error notifications can be received via email or Syslog. PresenTense Time Server is an enterprise class windows time server that is easy to install, configure and maintain.
Technical facts And Features for PresenTense Time Server

USB disconnect recovery support
Update BIOS/CMOS clock regularly
Email notification upon error - now supports SMTP AUTH
Selective binding to interfaces on multihomed hosts
Configurable polling for GPS clocks upon COM port failure
Low cost of ownership, no yearly fees and support included
Multi protocol time server
Synchronizes to almost any true time source
Powerful configuration settings
High degree of accuracy
Offers time services to clients via your PC
Synchronizes to GPS receivers supporting the NMEA 0183 protocol
Drivers for many reference clocks including Spectracom and Hopf
Accurate, inexpensive and reliable
Supports SNTP, UDP, TCP and NTP3 / NTP4 time server protocols
Simultaneously supports clients using different time protocols

NTP drivers for many GPS Receivers included
Free Run Support
Automatic compensation for system clock drift
Redundancy if time source unavailable
Runs as a true Time Server System Service
Highly Customizable
Remote Monitoring and Administration
Advanced statistical filtering to give high accuracy The license of this networking software is Freeware, you can free download and free use this Networking software.