A Debian Live system is a Debian operating system that does not require a classical installer to use it. It comes on various media, including CD-ROM, USB sticks, or via netboot.
GParted Live is a small bootable GNU/Linux distribution for x86 based computers. It enables you to use all the features of the latest versions of the GParted application.
Memtest86 is a thorough, stand alone memory test for x86 architecture computers. Web site: http://www.memtest.org/
From the download page, download either the Pre-Compiled Bootable ISO in order to create a CD or the Auto-installer for a bootable USB drive (Win 9x/2k/xp/7).
FreeDOS is a free DOS-compatible operating system for IBM-PC compatible systems. FreeDOS is made of up many different, separate programs that act as “packages” to the overall FreeDOS Project.