Clonezilla - Clonezilla is a suite of software that's designed to allow you to back-up and image new hard drives with your data.
Team Win Recovery Project (TWRP) - Custom recovery used for installing custom software on your device.
Rufus - Rufus is a piece of software that allows you to transform a portable drive, like a flash drive or other USB drives, into a bootable drive that can be used for a variety of purposes. Read more about Rufus.
Heimdall - Heimdall is a cross-platform open-source tool suite used to flash firmware (aka ROMs) onto Samsung...
Balena Etcher - Flash OS images to SD cards & USB drives, safely and easily.
OrangeFox recovery - OrangeFox Recovery is one of the most popular custom recoveries. With amazing additional features, fixes and bunch of supported devices