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Doodle: Live Wallpapers
(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.
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Uhm but I meant a regular app update? It's done the same way on F-Droid, Play Store, GitHub and manual APK installation.