Win32 Disk Imager - Create and restore image backups of disk drives.
Macrium Reflect - Macrium Software - the creators of Macrium Reflect backup, imaging and cloning software.
SD Card Formatter - SD Card Formatter is software for Mac OS X and Windows operating systems that can formats all SD memory cards, SDHC memory cards, and SDXC memory cards quickly and easily.
Roadkil’s Disk Image - Roadkil’s Disk Image is a tool for creating, writing and reading disk images file to hard disk, floppy disk, USB and any other external removable media.
Clonezilla - Clonezilla is a suite of software that's designed to allow you to back-up and image new hard drives with your data.
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.