I'm the one sort of maintaining the OPRF one (maintaining, not really improving - I've been focusing on the MiG-21 for a while). I know FGUK also has also updated theirs, and have added in a little bit of my code (specifically the g-limiting bit). Most of the work done on it was done by the FGUK guys, I mainly just ported over radar and weapons to the OPRF system.
My repo is at
https://github.com/l0k1/eurofighter. It's OPRF compliant with fully working air to air and good radar (air to ground isn't working very well at the moment). The next planned update is to add RCS return signal strength to the radar, that's being tested in the Viggen right now first before porting it over to other aircraft. Long term I'd like to do a JSBSim version, but that's a long ways away - after much of the work on the MiG is done.
Anywho, pull requests are welcome and encouraged.