Odin (firmware flashing software)

Odin is a utility software developed and used internally by Samsung which can be used to flash a Custom Recovery firmware image (as opposed to the Stock recovery firmware image) to a Samsung Android device. It is also used as a way of unbricking an Android device. There is no account of Samsung ever having officially released it, and is believed to be the result of an unintentional leak. Odin is Windows-only software, providing no support for other operating systems, though it is possible to use Wineskin on the Odin executable, allowing it to run on OS X.

There is a free/libre similar software called Heimdall.