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History of CS & Programing
(lemmy.ml)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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There's a great documentary from the 1980s called "Wargames" /j
Seriously though, I would recommend the YouTube channel "Computerphile". It's by the same guy who does Numberphile but it's all about computer science topics. They often give a bit of the history for how things came about. Tom Scott's YouTube channel has many computer science topics as well, though AFAIK he hasn't done any recently.