If anyone is looking for realtime collaboration tools, there's a free (proprietary) one that has live video + audio chat and a shared project workspace for building songs.

https://beatconnect.com/

The homepage does a pretty poor job of showing what it is, so it'll probably make more sense if you just see it:

https://youtu.be/r9gyup4nzoQ?t=14

https://www.youtube.com/watch?v=44n_8oXJYD0