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SDF Public Access Unix System

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Super Dimension Fortress (SDF, also known as freeshell.org) 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. The name derives from the Japanese anime series Super Dimension Fortress Macross, the original server having been used as a BBS for anime fans. Basic membership is free after validation, more sophisticated supplemental membership levels are available after donations.

SDF offers to its members:

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