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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You can donate to F-Droid Limited (which runs the core infrastructure) directly via:

Look here https://f-droid.org/donate/
Open-source project: https://gitlab.com/fdroid/fdroidclient
List of all changes: https://gitlab.com/fdroid/fdroidclient/raw/HEAD/CHANGELOG.m