There's Mercurial aka hg. I started with it about 7 years ago because git was "too hard". I couldn't find explanations about what "origin" or "HEAD" are and it all looked like a mess. So hg was much better (read: simpler) for me at the time. I don't quite remember the details but eventually I started looking at git and GitHub was also gaining popularity. It never had Mercurial support unlike BitBucket which I think I used back then. I sorted out all the essential knowledge about remotes, refs, commit hashes (instead of monotonically increasing revision numbers in hg) and switched in the end.
I never looked back.
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