I've started a new project over on Hackaday... It's for a GPS disciplined OCXO. What it does is make a 20 MHz LVCMOS square wave that you can use as a reference for other projects or devices in your lab. Although I went with 20 MHz, a lot of lab test equipment works better on 10 MHz, so I plan on building at least a variant (if not the only version) that outputs 10 MHz.
Check out the work in progress over on hackaday.io!