What is F-Droid?

F-Droid is an installable catalog 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.

F-Droid is described as 'The F-Droid Repository is an easily installable catalog of free and open source apps for Android. With F-Droid, it's easy to browse and install apps on your device, and keep track of updates. You can also browse the repository with a web browser, and download the app' and is a leading App Store in the online services category.