It’s well known Android is very fragmental, different system version, platform, and tons of app stores different from apple store. As an example, there’s more than 400 stores in China. For most of users, we can get apps on google play. Here list another alternative android appstores with short reviews:
It’s available in USA currently. Each app is reviewed by manual to ensure its qualify ad security. And also there’s daily app for free. To get them outside usa, Market Unlocker is recommended.
350,000 mobile applications across major handset platforms including Java ME, BlackBerry, Symbian, Windows Mobile and Android