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Awesome Fdroid Games
(lemmy.world)
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
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lichess has finally published it's mobile version on f-droid.
droidfish is another great alternative chess game, though with no online component.
there's also endless sky