APKCombo - APK Downloader - Download APK & OBB files from Google Play Store and APKPure (Latest Version)
F-Droid - F-Droid is an interesting alternative for Android users who want to try something different and not have to use the Goole Play store all the time.
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
Android Freeware - Android Freeware is a dedicated platform for those Android users who want to enjoy quality and reviews Android apps and games for free.
APKMirror - Android Market and APK Downloads
Evozi APK Downloader - Download APKs directly from http://alternativeto.net/software/android-market/ to your computer.