- 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.
- Island One Society - Propulsion systems, business ideas, archives of space meetings and journals, and political advocacy for the space frontier.
- 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 a
- 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 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.
- Denie's Off World Training - Bodybuilding, weight training, and related matters, with this section covering the problems and need for resistance machine activities in zero-g.
- Interstellar Missions - News of breakthroughs in propulsion physics and the search for extra-solar planets that will enable missions beyond the solar system.
- Artificial Gravity - Articles on rotating structures by Ted Hall, with links to dissertation, conference papers, and software.
- International Space Settlement Design Competition - An annual event in which teams of high school students prepare designs for cities in space.
- The Space Flag - A flag designed to be flown by supporters of space colonization.
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