F-Droid - FOSS repository for Anndroid. Alternative to Google Play

The F-Droid Repository is an easily-installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The server contains the details of multiple versions of each application, and the Android client makes it easy to browse, install them onto your device, and keep track of updates. You can also browse the repository with a web browser, and download the applications directly from there if you can’t or don’t want to run the F-Droid client on your device.