Build your own GIT server
Most developers have nowadays migrated to Git from arcane, older legacy systems, and this is for good. We use it because...
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All you need to run git between working copies is different working copies. You don't need a git "server" or anything - you can use any old account you have ssh access to.
Yeah, that's actually the bottomline.
Pretty much everyone uses GitHub it is more than good enough. I need some reasons to use my GitLab and Bitbucket accounts. 😅