AppAgg - Application Aggregator
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
AppRecs - AppRecs sorts through reviews in the App Store and automatically helps you filter out inauthentic results.
Product Hunt - A website that lets users share and discover new products