I'm wondering if anyone did this. That means, build a map not all alone (except testing), but simultaneously with a group of people, maybe a team of 2-4 members.
Which techniques/strategies did you use then and was it cool or not? I guess, "general purpose" version control systems like Git or Mercurial are not suitable for mapping?
I'm asking because I certainly have too little time to do something cool before I "burn out", but if this is possible, I wish to collaborate.