The Indie Gala - Buy a bundle of games, you decide the price, and support charity in the process.
F-Droid - F-Droid is an interesting alternative for Android users who want to try something different and not have to use the Goole Play store all the time.
Humble Bundle - Buy a bundle of games, you decide the price, and support charity in the process.
Aptoide - Aptoide is a third party replacement for the traditional Google Play Store.
Fanatical - Buy awesome games. Pay a fraction of the retail price!
APK Pure - Download apk for Android with APKPure APK downloader. NoAds, Faster apk downloads and apk file update speed. Best of all, it's free