UNetbootin loads utilities or installs Linux/BSD to a partition or USB drive without a CD. It can use an existing disk image/kernel/initrd file, or download a supported distro or system utility (such as Ubuntu, Fedora, openSUSE, FreeBSD, PartedMagic, etc
FUSBi, the Free USB Installer, downloads free GNU/Linux Distributions for you and creates bootable USB images. FUSBi supports automated installation of of all the FSF-endorsed Free Software GNU/Linux Distributions, such as gNewSense, UTUTO, Dynebolic, Musix GNU+Linux, BLAG and GNUstep. You can also use it with your local image files. FUSBi is a Free Software itself and is licensed under GNU General Public License version 3 or later.