The more robust solutions were generally quite tedious, and none of them worked for all ISO images, as explained here: Boot 'any' ISO image or boot 'all' ISO images.

liveusb-creator - Cross-platform tool for easily installing live operating systems on to USB flash drives.

UNetbootin - Allows for installation of Ubuntu, Fedora, openSUSE, and various other Linux distributions from Windows or Linux without a CD.

Billix: Multi-Boot USB Key distribution.

multicd.sh - Combine several CDs into one multicd.sh is a shell script designed to build a multiboot CD image containing many different Linux distributions and/or utilities.

MultiBoot USB with Grub2 (boot directly from iso files).

Roll Your Own Multiboot Usb Flash Drive.

Guide to Create a multi-boot rescue USB flash drive.

Mk-boot-usb: a Script to Create Multiple-Bootable USB Keys.

WinBuilder - A script engine that will run projects developed by several authors which produce very efficient boot disks available for several Windows platforms.

Multiboot USB (PE, Linux And DOS) using Syslinux, GRUB4DOS and/or multiple partitions.

Creating Multiboot USB flash drive step by step.

Use ISOEmu boot installation ISO image from hard disk.

Multi Multi Multi Boot USB HD, Backtrack 3, XP SP3 Installation, Ultimate Boot CD.

How to set up a USB Flash key to boot to WinPE+BartPE+MS-DOS+FreeDOS, Using RMPrepUSB.

miniPE, BackTrack and Knoppix in an USB pen.

Multiboot DVD by Aero step by step | Run AeroStudio ISO from USB Flash Drive

Aeroboot 2010 - Scriptable Graphic Multiboot Menu System.

Guide for MultiBoot USB-stick with boot.ini Menu.

Guide for Multi-booting from a USB Drive.

Shardana Antivirus Rescue Disk - Supports bootable antivirus utilities, Linux LiveCDs, and Windows PE discs.

Creating a multiboot USB drive (PDF) - Tested with Acronis True Image, FreeDOS, MemTest86+, Ultimate Boot CD, and WinPE.

The Multipass USB Project - Uses PeToUSB, grubinst and grubfordos to boot: Trinity Rescue Kit, Kon-Boot, Ophcrack, DBAN, Hiren's 9.9, Ubuntu 9.04 LiveCD, Windows 7 Install DVD, BackTrack 4, and Macrium Reflect from a single USB drive.

How to install Windows from USB: WinSetupFromUSB with GUI - Supports multiple Windows XP/2Kx sources in the same partition BartPE/WinBulder/UBCD4Win/WinFLPC (NOT ramdisk versions) to any primary partition Vista/Windows 7/Server 2008 setup to different primary partitions PartedMagic other grub4dos CD emulation compatible ISOs SyLinux bootsector as a file, and optionally a directory, containing a Linux distro booting off SysLinux.

Some of the possible solutions I found included:

I envisioned being able to simply copy any bootable CD or DVD (Windows installers, OS X boot discs, Linux Live CDs and recovery discs like Knoppix, etc) to a USB drive and boot it normally. I spent days looking for a way to boot any and all ISO images from a USB drive. Boot any and all ISO images from USB driveīoot any and all ISO images from USB drive #

Multiple linux iso usb