Fnd - Browse Apple App Store and iTunes on the Web
iOSGODS! - iOSGODS!
AppRecs - AppRecs sorts through reviews in the App Store and automatically helps you filter out inauthentic results.
5play.ru - 5play.ru enables you to download highly-rated Apps and Games for Android devices.
Knicket App Search - The future Wikipedia for Apps
Altstore - A home for apps that push the boundaries on iOS