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.
Cydia - An alternative app store for jailbroken devices.
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
IPackager - IPackager is an app for non-jailbroken devices and installs many Cydia tweaks without the need of a...
APKMirror - Android Market and APK Downloads
iNoJB - iNoJB, formerly iNoCydia, is an amazing Cydia alternative requiring no jailbreak!