UCheck - UCheck is a tool that will help you to keep your software updated.
Amazon Appstore - The Amazon Appstore is a place to purchase and download apps for your Android device.
Avira Software Updater - Application that searches updates for software on your computer
GetJar - Discover and play paid apps and games for free.
HEIMDAL FREE - HEIMDAL FREE is an application to automate your device software updates in order to improve your security.
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.