Have you checked with the various companies that specialize in CAN tools and software? IXXAT, Kvaser, Vector etc. If not then what's the requirements, does it have to be open source? Any particular language(s)?

Excellent suggestion, I Googled around a lot for a solution, but didn't know / check the websites of these companies. On the website of Kvaser I found something nice, They have an SDK for Canlib which seems to be exactly what I need, I just cant get it to work yet, having trouble using the DLL's (VS22 gives an not found error while I checked everything). Ill report back when I figure it out.

To answer your question, only requirement is that it needs to make j1939-compatible DBC's. C# is preferred but yeah, anything that works.

To use Kvaser's Canlib in C# you must add a reference to the dotnet KvadbLib.dll, AND copy another dll Kvaser.KvadbLib.dll (almost same name) from Kvaser's canlib bin folder to your projects executable folder.

Ok seems that you might be able to answer your own question then :) Which is fine - it is encouraged to post answers to your own questions if you found it yourself.

Yeah was just making an example real quick first, needed to know that it would work. Tested it in Vector, seems fine. Thanks again!