AppAgg - Application Aggregator
AppRecs - AppRecs sorts through reviews in the App Store and automatically helps you filter out inauthentic results.
AlternativeTo - AlternativeTo lets you find apps and software for Windows, Mac, Linux, iPhone, iPad, Android, Android Tablets, Web Apps, Online, Windows Tablets and more by recommending alternatives to apps you already know.
Fnd - Browse Apple App Store and iTunes on the Web
APK Pure - Download apk for Android with APKPure APK downloader. NoAds, Faster apk downloads and apk file update speed. Best of all, it's free
JazzMyApp - Let JazzMyApp surprise you with amazing apps everyday. Try it out yourself.