YUMI - YUMI (Your USB Multiboot Installer), is a tool that allows you to boot multiple ISO files from one USB drive.
ROSA Image Writer - Rosa Image Writer is a program for writing images to a flash disk.
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.
UNetbootin - UNetbootin is a utility for creating live bootable USB drives. The name of the software is short for Universal Netboot Installer, and its most prevalent use has been to create bootable versions of Linux distributions on a USB drive.
SUSE Studio ImageWriter - Utility for writing raw disk images & hybrid isos to USB keys.
DiskImager - A Windows Disk Imager. A C#.NET utility for reading / writing SD cards and USB devices