• We have updated our Community Code of Conduct. Please read through the new rules for the forum that are an integral part of Paradox Interactive’s User Agreement.
No, those are proprietary. As is the new Jomini framework that IR and CK3 use, FYI.
 
No company in the history of video gaming has released their game engines out into the public unless it's something very old and outdated (like the Doom Engine from way back when). The reason is very simple, for security and corporate interests.