Rasberry Pi Time server with GPS.
A Rasberry PI 4 timeserver.
I have created a timeserver serving my home network the time via the NTP protocol. The goal is to create a accurate timeserver that does not need the internet. Because if you do use the internet why not use the internet provided ntp servers. There are quite a lot of setups where internet connectivity is intermittant or not allowed due to security reasons. I used a GPS receiver to receive time information(UTC) and via the PPS signal also a frequency standard. A Rasberry PI is a nice small computer that runs Linux and thus can run the ntp server.