Etcher!

The Reliable USB Formatting Utility

UNetbootin (Universal Netboot Installer) is a cross-platform utility that can create Live USB systems and can load a variety of system utilities or install various Linux distributions and other operating systems without a CD.

YUMI (Your Universal Multiboot Installer), is the successor to MultibootISOs. It can be used to create a Multiboot USB Flash Drive containing multiple operating systems, antivirus utilities, disc cloning, diagnostic tools, and more. Contrary to MultiBootISO's which used grub to boot ISO files directly from USB, YUMI uses syslinux to boot extracted distributions stored on the USB device, and reverts to using grub to Boot Multiple ISO files from USB, if necessary.

LiLi USB Creator is a free software for Windows that allows you to create a bootable Live USB key with a Linux on it.

Universal USB Installer is a Live Linux USB Creator that allows you to choose from a selection of Linux Distributions to put on your USB Flash Drive. The Universal USB Installer is easy to use. Simply choose a Live Linux Distribution, the ISO file, your Flash Drive and, Click Install. Other features include; Persistence (if available), and the ability to fat32 format the flash drive (recommended) to ensure a clean install. Upon completion, you should have a ready to run bootable USB Flash Drive with your select Linux version installed. »

Create and restore image backups of disk drives.

MultiBootUSB is a software to create multi boot live Linux on a removable media i.e USB disk. It is similar to UNetbootin but many distros can be installed, provided you have enough space on the disk. MultiBootUSB also provides an option to uninstall distro(s) at any time, if you wish.

WinToFlash starts a wizard that will help to make USB bootable and pull over the contents of a windows installation CD or DVD and prep the USB drive to become a replacement for the optical drive. It can also do this with your LiveCD or DOS.

SARDU (short for Shardana Antivirus Rescue Disk Utility) creates a multiboot all-in-one USB drive, CD or DVD for free (personal and non commercial use). Hard disks, external hard disks and all removable media are supported.The bootable device can include comprehensive collections of antivirus rescue cd, utilities and popular live distributions of Linux. Windows PE can also be included, as well as recovery disks and install media for Windows XP, Windows Vista, Windows Seven and Windows Eight.The multiboot USB supports and manage USB stick, pendrive, hard disks and all removables media. »

WinSetupFromUSB is a Windows program, which prepares multiboot USB flash or fixed disk to install any Windows versions since 2000/XP, boot various Linux and *BSD flavors, as well as many Windows, Linux, DOS based and other utilities. Since version 1.1 program can create USB disk with Windows versions which support (U)EFI (Vista x64 SP1 and later x64 versions), which USB disk can be used in both (U)EFI and Legacy BIOS modes.

Free application to Restore/Backup SD Cards and USB drives, initially intended for Raspberry Pi users, but also very suitable for other applications, including making backups of your USB drive. Compression (gzip, 7-Zip, zip, etc) is supported for restores and backups.

Multisystem is an awesome tool created by LiveUSB.info, that works similar to our Windows based MultiBootISOs USB creator, but was created for use within Linux. It also uses Grub2 instead of Grub Legacy, and can be run from within Ubuntu Linux to create a Custom Multiboot UFD containing your favorite Bootable Live Linux Distributions. (via http://www.pendrivelinux.com/multiboot-create-a-multiboot-usb-from-linux/ )

LiveUSB Install is a free software for GNU/Linux and Windows.

Utility for writing raw disk images & hybrid isos to USB keys.