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A curated list of awesome FOSS games
(github.com)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
They seem to be a bit more lenient than me. Their list also includes games which depend on non-free assets, as long as the source code is free. Still, I will add this list to the list of lists in the post. Thanks!