There's quite a few old-school shooters that are open-source, for example:
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https://xonotic.org/ is a Quake-like arena shooter.
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https://unvanquished.net/ is an asymmetric arena shooter (humans vs. aliens) with RTS elements.
There's quite a few old-school shooters that are open-source, for example:
https://xonotic.org/ is a Quake-like arena shooter.
https://unvanquished.net/ is an asymmetric arena shooter (humans vs. aliens) with RTS elements.