To quote the SDF FAQ

The Super Dimension Fortress is a networked community of free software authors, teachers, students, researchers, hobbyists, enthusiasts and the blind. It is operated as a federally recognized non-profit 501(c)(7) and is supported by its members. Their mission is to provide remotely accessible computing facilities for the advancement of public education, cultural enrichment, scientific research, and recreation. Members can interact electronically with one another regardless of their location using passive or interactive forums.

To learn more about SDF, its history, and its mission, you can read

• The SDF FAQ
• SDF's Wikipedia Entry

The best way to learn about SDF is to join (Create a Free UNIX Shell Account), review access ^{1) 2)}, and then participate.

Unlike American Public Broadcasting, The Mozilla Foundation, and other popular non-profits, there are currently no large corporate sponsors of SDF. This means that it depends entirely on support from individuals like you.

SDF's 501(c)(7) status means that donations to it are not tax-deductible.

• Via PayPal (for donations of $5.00 or more):
• By Mail:
  Send a check, money order, or cash (USD($), CAD($), EUR(€), GBP(£), AUD($), RMB(¥), or JPY(¥)) to

SDF Public Access UNIX
PO BOX 17355
SEATTLE WA 98127 USA

• Via the donation button at the bottom of the main page: sdf.org

• SDF Fundraiser Store, a 501(c)(7) Nonprofit Organization

Donating to the SDF Public Access UNIX System - traditional link (using RCS)