> a lot of development happened in perforce

Interesting - that I didn’t know. Based on my personal p4 experience, I’m sorry anybody else had to use it.

That said - nobody has mentioned that git (and hg) was preceded and directly inspired by Larry McVoys BitKeeper[0]. Indeed, I’ve heard rumor that both “git” and “mercurial” were named after people’s perceptions of others personalities during the Linux/BitKeeper breakup/debacle.

[0] https://en.wikipedia.org/wiki/BitKeeper

It was a lot better than the alternatives at the time, which were CVS and SCCS.. :)

Add RCS to that list.

Still is, in some hardware companies.