Aptoide - Aptoide is a third party replacement for the traditional Google Play Store.
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
Hostapk - Hostapk is a website that offers one of the most comprehensive collections of Android APK.
Amazon Appstore - The Amazon Appstore is a place to purchase and download apps for your Android device.
APKMB - APKMB is a website dedicated to MOD APK files of various Android apps.
APKMirror - Android Market and APK Downloads