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.
Acronis Cyber Protect Home Office - (Formerly Acronis True Image) Complete protection for your digital life
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
Macrium Reflect - Macrium Software - the creators of Macrium Reflect backup, imaging and cloning software.
APKMirror - Android Market and APK Downloads
Clonezilla - Clonezilla is a suite of software that's designed to allow you to back-up and image new hard drives with your data.