The modding scene is (or, well, was) pretty active though, if you’re into that. There are still official te4 forums, but most folks hang out in the discord (yeah, I know.) including a couple old head modders that are pretty familiar with the codebase if you’re trying to do something exceptionally interesting with it.
Yes, it is, although they don’t seem to take a collaborative development approach, but you can grab the source and create derivative works.
The modding scene is (or, well, was) pretty active though, if you’re into that. There are still official te4 forums, but most folks hang out in the discord (yeah, I know.) including a couple old head modders that are pretty familiar with the codebase if you’re trying to do something exceptionally interesting with it.