Slackware

Slackware is a Linux distribution, created by Patrick Volkerding in 1993 and based upon the Softlanding Linux System. Slackware has been the basis for many other Linux distributions, most notably the first versions of openSUSE distributions, and is the oldest distribution that is still maintained.

Slackware aims for design stability to be the most "Unix-like" distribution of Linux; it doesn't have a bug tracking facility or public code repository.