DriveDroid is described as «allows you to boot your PC from ISO/IMG files stored on your phone» and is a bootable usb creator in the os & utilities category. There are more than 25 alternatives to DriveDroid for a variety of platforms, including Windows, Linux, Mac, BSD and Linux Mint. The best alternative is Rufus, which is both free and Open Source. Other great apps like DriveDroid are balenaEtcher, dd, UltraISO and MultiBootUSB.DriveDroid alternatives are mainly Bootable USB Creators but may also be DVD Burners or CD Burners. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of DriveDroid.