The Y Combinator Database - The definitive database of YC companies with all the metrics
Aptoide - Aptoide is a third party replacement for the traditional Google Play Store.
Y Combinator Companies - Interactive list of all 1000+ YC companies
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
Unicorn Republic - List of startups that evolved into $1 billion+ corporations
Amazon Appstore - The Amazon Appstore is a place to purchase and download apps for your Android device.