Tiny Core Linux 5.4 / 6.1 RC2
                      http://distro.ibiblio.org/tinycorelinux/
Tiny Core Linux is an open source project that provides users with a collection of minimal and modular Linux distributions that can be used to create full featured desktop and server operating systems, as well as appliances.

The project comprises of three main editions, Core, Tiny Core, and Tiny Core Plus. While the first one is the most tiny of them all and has no graphical interface, the second and third ones use a minimal window manager and various applications.
Distributed as 32-bit Live CDs

All three editions are available for download from the dedicated section (see above) as ISO images, supporting both 32-bit and 64-bit hardware platforms. They can be written to USB sticks or burned onto CD discs.
Boot options