Just Install - just-install - The stupid package installer for Windows.
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
Scoop - A command-line installer for Windows
Aptoide - Aptoide is a third party replacement for the traditional Google Play Store.
Windows Remix - Web-based batch software installer with zero dependencies. Recommended first visit after reinstalling Windows or buying a new laptop.
APKMirror - Android Market and APK Downloads