I’ve seen many threads suggesting products but they often don’t mention FOSS projects, which should always be preferred to corporate software. With FOSS you are already boycotting capitalism, on either side. Free and Open Source ignores borders and shouldn’t be categorized in nationalist terms, no matter where some of the maintainers happen to live.
Are there US open source projects?
There definitely are FOSS projects run by the US government: Ghidra is an open source reverse engineering tool developed by the NSA.
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I think the majority
I don’t know about that, to be honest.
I don’t have any hard data to back me up, but anecdotally I find that most FOSS software I use is headquartered in Europe. Quite often Germany. There are many maintainers from all over the world, but I feel like (again…in my experience) Europe has always been bigger into starting such projects.