F-Droid

The F-Droid Repository is an easily-installable catalogue 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 directly from there, if you can’t or don’t want to run the F-Droid client on your device.

• F-droid.org 
• Alternativeto.net-F-droid
  
  

APK Pure

APK Pure is a totally free APK downloader for Android phone and tablet,download apk directly from...

• Apkpure.com
• Alternativeto.net-apkpure

Aptoide

Aptoide is a distributed marketplace for mobile applications which runs on the Android operating system. In Aptoide, unlike the default Google Play Store, there is not a unique and centralized store but each user manages their own store.

• Aptoide.com
• Alternativeto.net-Aaptoide