My go to place for android games and apps, easy to download APK files
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
APKMirror - Android Market and APK Downloads
Phandroid - Phandroid is a website where you can get your favorite Android apps downloaded for free.
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.
AndroLib - AndroLib is a free source over the internet that allows the Android smart devices users to get an instant and probably the free access to all kind of Android apps and games available in the Android Market over the internet.
Aptoide - Aptoide is a third party replacement for the traditional Google Play Store.