Super Dimensional Fortress (SDF) is one of the oldest public access UNIX systems on the Internet.

It has been operational in some shape since the year 1987 as a non-profit organization. Basic membership is free after validation, more sophisticated supplemental membership levels are available after donations.

SDF offers to its members:

  • Substantial webspace, with largely unrestricted CGI capability
  • Mail address and box with spam-filtering
  • Gopher space
  • Access to a UNIX NetBSD shell running on high-powered, 64-bit computers
  • Inclusion in a non-commercial techie community with a bulletin board, local NNTP, instant messaging, and a MUD or two
  • At a slightly higher level of membership, use of code development and networking tools

External links

(Also known as freeshell.org)