I somehow succeeded in making a port for openCAs OCSP responder (including the necessary libpki).
I know the whole project is more or less dying (though some recent updates in libpki show some interesting life evidence), but as far as I know there is no other free solution for an OCSP responder except openSSLs very limited one (especially not supporting more than one intermediate CA).
The port has been working for me reasonably well, I wouldn’t say it is tested though, but I thought it could be of interest for others.
Created attachment 228965 [details]
Patch against ports tree