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
APKMirror - Android Market and APK Downloads
Samsung Kies - Samsung Kies is a freeware software solution used to communicate between Mac or Window OS and more recently Samsung smartphones and tablets.
Aurora Store - Aurora is a FOSS Play Store client that does not require a Google Account to download directly from Play Store. However you can login with your Google Account to download your already paid apps!
Uptodown - Uptodown is a mobile app and website that lets you download games and apps to users on most of the major platforms.
Amazon Appstore - The Amazon Appstore is a place to purchase and download apps for your Android device.