Common Universalis is an open-source mod that anyone can contribute to. Our github link is:

https://github.com/Corpsemania/Common-Universalis-Internal

If you want to join the mod team, or simply want to change certain part of this mod, feel free to contact me and post your work on github. If your work is good enough, it will be integrated to the formal version.

This site also serves as an off-steam download site of CU's internal version.