Mtools - Mtools is a collection of utilities to access MS-DOS disks from GNU and Unix without mounting them.
USBImager - A very minimal GUI app that can write compressed disk images to USB drives.
WinUSB - multiboot - WinUSB - simple, portable and lightweight tool, lets you create multiple Windows bootable USB flash...
ROSA Image Writer - Rosa Image Writer is a program for writing images to a flash disk.
YUMI - YUMI (Your USB Multiboot Installer), is a tool that allows you to boot multiple ISO files from one USB drive.
SUSE Studio ImageWriter - Utility for writing raw disk images & hybrid isos to USB keys.