UNetbootin is a bootable USB drive creator for Operating Systems like Ubuntu, Fedora, and other Linux’ instead of a CD. It runs on Windows, Linux, and Mac OS X. It downloads the distribution files (.iso file) if you don’t have one. Otherwise you may supply your own Linux .iso file.
It works on Windows (2000, XP, Vista and 7), Linux and Mac OS X. It needs an internet connection for downloading files if needed. The current version has inbuilt support for automatic download for distributions including Ubuntu, Debian, Linux Mint, FreeBSD and Fedora.
UNetbootin can also be used to load various system utilities, including disk partition utility Parted Magic, system repair tool SystemRescueCD, GRUB repair utility Super Grub Disk, Dr.Web Antivirus, F-Secure Rescue CD, and Kaspersky Rescue Disk, which remove malware from Windows installs.
It also supports Backtrack, a utility used for network analysis and penetration testing, Windows password recovery utility Ophcrack, Windows registry and password editor NTPasswd, boot loader Gujin, Smart Boot Manager (SBM) and FreeDOS.