PERMANENT
Rapid development of space using material from asteroids near Earth and from the Moon.

The Space Frontier Foundation
Articles, discussion sites, meetings, and government advocacy dedicated to opening the space frontier as rapidly as possible.

Space Settlement
Discusses the space settlement proposals of Gerard K. O'Neill, as popularized in his book "The High Frontier". Features pictures and a FAQ.

Space Studies Institute
The organization founded by Gerard O'Neill, with detailed information about his space settlement proposals.

International Space Settlement Design Competition
An annual event in which teams of high school students prepare designs for cities in space.

Island One Society
Propulsion systems, business ideas, archives of space meetings and journals, and political advocacy for the space frontier.

Artificial Gravity
Articles on rotating structures by Ted Hall, with links to dissertation, conference papers, and software.

Space Colonies
Full text of the 1977 CoEvolution book Space Colonies , which is now out of print.

Living on Green Islands in Space
Information about O'Neill-type orbiting habitats and why we may want to built them.

Galleria 2433
Ideas for colonizing the moon, Mars, the asteroid belt and the galaxy.

URANOS: Club for Expansion of Civilization into Space
A group of people, mainly Poles or of Polish origin, who believe that expansion into space is a prerequisite for further development of our civilization. An English version of the site is maintained.

Space Settlement Initiative
A proposal to grant ownership of land on the moon and Mars to companies that establish settlements and agree to sell passage to anyone willing to pay a fair price.

The Interstellar Society
Newsletters, discussions and design concepts for interstellar exploration of space offered by a non-profit organization.

Office of Space Commercialization
US Government office - studies on market for space tourism, satellite industry, and other aspects of space development.

Space Solar Power at NASA
design and development of solar power satellites and solar power systems for use in space.

Laying the Foundation for Space Solar Power: (2001)
National Research Council study of NASA's late 1990's space solar power efforts.

Oregon L5 Society
Oregon chapter of the National Space Society; many studies and reports on in-situ resource utilization and related aspects of space development.

The Space Settlers' Society
contacts and articles on European space advocacy, ramjets, and space tourism.

Space Settlement
NASA research office offering introduction to the subject with studies, on-line books, links and a student contest.

National Space Society Roadmap for the Settlement of Space
List of Milestones and Barriers to Space Settlement

Critical Path Roadmap
NASA analysis of critical research and development needs for human exploration and settlement of space.

SpaceArchitect.org
official website of an American Institute of Aeronautics and Astronautics subcommittee on aerospace architecture comprising architects and associated professionals who organize conference papers, develop educational tools, collaborate on design projects and promote related research in the field of aerospace architecture in space and on Earth.

Totipotent.org
How and why planet Earth is in position to "give birth" and spread life to the rest of the universe.

Beanstalk elevator
"Virtual beanstalk" amateur design group for a (small scale) space elevator.

Notable Nearby Stars
Information about nearby star systems out to 65 light years.

Space Elevator Reference
Scientific, engineering, economic and policy challenges inherent in constructing the solar systems first space elevator.

NASA Ames - Space Settlement Contests
Annual design contest for school-age kids, grades 6-12. Links to winning designs.

DaedalusaL4 Guide
Detailed design study for a 10,000 person space settlement in Earth orbit, using current technology. 2000 Grand Prize Winner in Space Settlement Design Contest.

Space Solar Power Monitor
News, discussion, links to latest information on SSP.

The Case for Space
Articles and short stories by Robert Weidner, on various roads to space colonization.

The Preparation
Links between nanotechnology and space colonization; essays on the transhuman future.

The Space Settlement Institute
A non-profit association founded to help promote space colonization; emphasis on property rights law.

Foundation Future 25
Emerging platform for long-term thinking, acting and growth. Supporting space colonization and the the development of life and humanity on earth earth, the planets and in the universe.

Space Solar Power Workshop
Discussion of the energy path for space development.

Centripetal Vivarium Space Habitats
Advocates, as preferable to lunar colonisation or terraforming, the construction of huge manufactured living spaces that can be spun to create gravitational effects.