Aptoide - Aptoide is a third party replacement for the traditional Google Play Store.
vShare - vShare is an app through which you can download apps, games, wallpapers, and ringtones for your Android and iOS devices.
Ninite - Ninite is the easiest way to install software.
AppAddict - AppAddict is an online tool that allows you to download third-party apps on your devices without rooting or jailbreaking your devices.
Amazon Appstore - The Amazon Appstore is a place to purchase and download apps for your Android device.
Mob.org - Mob.