F-Droid
F-Droid App
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.
Download the following APK:
F-Droid Privileged Extension
Services to allow F-Droid to securely install and update apps.
Download the “Over-The-Air” (OTA) update ZIP file.
https://f-droid.org/en/packages/org.fdroid.fdroid.privileged.ota/