- Aerospace Technology Working Group (ATWG) – professional group that publishes Beyond Earth: The Future of Humans in Space and the forthcoming Living in Space
- Al Globus Space Settlement site (principal author of the NASA Space Settlement site)
- The Artemis Project – a private venture to establish a permanent, self-supporting community on the Moon
- Creating a Solar Civilization – essay by Kim Peart
- Cygo’s Space Initiative – Asteroid mining, space product concepts, etc.
- 4Frontiers – emerging space commerce company focused on the settlement of Mars
- Hobbyspace.com Life in Space links – Lots of links
- Island One – a resource for those who will build free societies beyond the Earth
- The Mars Society – to further the goal of the exploration and settlement of the Red Planet
- The Moon Society – to further the creation of communities on the Moon involving large-scale industrialization and private enterprise
- NASA Space Settlement site and mirror sites:
- NASA hosted site (Ames Research Center)
- National Space Society mirror site (newest design)
- See also Al Globus Space Settlement site (principal author)
- NASA, SpaceX and the Future of Space – Op Ed from The Guardian Express Newspaper
- Out of the Cradle – Great site for book reviews and more
- Paths to Space Settlement – Slides from a 2008 talk by Al Globus
- P.E.R.M.A.N.E.N.T. – Projects to Employ Resources of the Moon and Asteroids Near Earth in the Near Term
- Saving the Earth by Colonizing the Moon – An environmental approach with DVD available
- Space Architect – spacearchitect.org is the official website of the Space Architecture Technical Committee of the American Institute of Aeronautics and Astronautics
- Space Frontier Foundation – People dedicated to opening the space frontier to human settlement
- Space Future – Excellent website with huge amounts of information. Highly recommended.
- Space Settlement – Mike Combs’ space settlement pages include a good FAQ
- Space Settlement Institute – A think tank dedicated to finding ways to make space settlement actually happen in our lifetimes. Sponsors of the Space Settlement Initiative.
- Space Studies Institute – Research foundation created by Gerard K. O’Neill
- Sylvia Engdahl’s Space Subsite – Science fiction author’s views on “Why I believe colonization of space is essential to the survival of humankind”, space quotes to ponder, good set of links
- The Top 3 Reasons to Colonize Space – Freeman Dyson, J. Richard Gott, III, and Sid Goldstein all agree it’s time to leave the planet
