GRUB - Multiboot boot loader
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.
PLoP Boot Manager - The PLoP Boot Manager is a small program to boot different operating systems.
Aptoide - Aptoide is a third party replacement for the traditional Google Play Store.
Boot Repair Disk - A simple tool to recover access to your Operating Systems. * Easy-to-use (repair in 1 click ! )
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