The Official Release of Slackware Linux by Patrick Volkerding is an advanced Linux operating system, designed with the twin goals of ease of use and stability as top priorities. Including the latest popular software while retaining a sense of tradition, providing simplicity and ease of use alongside flexibility and power,
Since its first release in 1993, the Slackware Linux Project has aimed at producing the most "UNIX-like" Linux distribution available. Slackware meets the Linux standards, such as the Linux File System Standard. The foxus has always been simplicity and stability paramount, and as a result Slackware has become one of the most popular, stable, and friendly distributions available.
Some Slackware distros include:
Slackware: the oldest active Linux distribution
Porteus: It's small (under 300Mb) and insanely fast which allows you to start up and get online quickly
Slackel: a Linux distribution and live CD based on Slackware Linux and Salix OS.