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Git, invented in 2005. Programmers on 2004:
(lemmy.eco.br)
Welcome to Programmer Humor!
This is a place where you can post jokes, memes, humor, etc. related to programming!
For sharing awful code theres also Programming Horror.
Before that, it was RCS, released in '82.
Or gnu arch
Luckily I'm young enough that I never had to use RCS.