QooApp is described as 'alternative market for Asian video games that lets you download tons of Android games directly to your smartphone or tablet. You'll find games inspired by Saint Seiya, Dragon Ball, One Piece, and Naruto, just to name a few well-known franchises' and is an app in the Online Services category. There are more than 50 alternatives to QooApp for a variety of platforms, including Online / Web-based, Android, Android Tablet, Windows and Kindle Fire. The best alternative is F-Droid, which is both free and Open Source. Other great apps like QooApp are Google Play Store (Free), Aurora Store (Free, Open Source), Aptoide (Free, Open Source) and APKPure (Free).
Aurora Store is an unofficial, FOSS client to Google's Play Store with an elegant design. Not only does Aurora Store download, update, and search for apps like the Play Store, it also empowers the user with new features.
Aptoide is a distributed marketplace for mobile applications which runs on the Android operating system. In Aptoide, unlike the default Google Play Store, there is not a unique and centralized store but each user manages their own store.
The project's aim is to promote free and open source software on the Android platform. Fossdroid takes its data from F-Droid, but organizes apps in an attractive, Google Play-like arrangement with the ability to view apps by popularity.
In an effort to make things easy, and maybe even fun, AndroidPolice.com created APK Mirror. Over the past several months, they've been working to build a smooth, reliable, trust-worthy site to host the downloads users love. You also can upload APKs to the site yourself.