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Google sideloading and F-droid prospects
(lemmy.ml)
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
The term "application" far precedes iPhones. I don't know why that term is associated with them. I usually use the term app for any application, on Linux or Android.