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Eternity, a Infinity for reddit fork, is now on F-droid
(f-droid.org)
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.
Matrix space | forum | IRC
You can always just run android apps on desktop. Waydroid works on Linux Wayland but I'm sure there are windows alternatives