EarthColony1
- Nonprofit plan to establish the first near-earth space colony to preserve human culture and forward human expansion into space.
- http://www.earthcolony1.org

Galactic Mining Industries Inc.
- Established to colonize space through profit from mining extraterrestrial resources.
- http://www.space-mining.com/

4Frontiers Corporation
- Technology company focused on developing self-sustaining permanent Mars settlement.
- http://www.4frontiers.com/

Alliance to Rescue Civilization
- A private foundation, led by William E. Burrows and Robert Shapiro, that aims to backup civilization in facilities away from Earth, to ensure survival in the event of a planetary catastrophe.
- http://www.arc-space.org

Kennedy II Lunar Exploration Project (K2LX)
- Proposal to develop the Moon; funding in part through real estate sales.
- http://www.kennedyproject.com

Lifeboat Foundation
- Arguments why life on Earth may become extinct in the coming century, and a plan to save humanity through colonies in space.
- http://lifeboat.com/

Blue Origin
- Aerospace R&D company working on spacecraft and launch systems with the ultimate goal of contributing to an enduring human presence in space.
- http://www.blueorigin.com/

Institute for Scientific Research, Inc. - Space Elevator
- Technical details, meetings, images, and FAQs about building a space elevator.
- http://www.isr.us/SEHome.asp

LiftPort - The Space Elevator Company
- Company devoted to building a vital and highly profitable infrastructure for off-world industry. The Space Elevator is a key enabling technology for any work done off the planet, whether in near-earth orbit, at geosynchronous distances, or far beyond the
- http://www.liftport.com/

1000 Planets Inc.
- Company news and activities - a for-profit space venture looking at space transportation and colonization opportunities.
- http://www.1000planets.com/

Orbital Development
- Greg Nemitz's space development company.
- http://www.orbdev.com/

The L5 Development Group
- A privately funded, for profit, space exploration and development program whose initial business plan is to build space colonies at L5 and manufacture solar power satellites to meet the Earth's energy needs
- http://l5development.com/

The Eros Project
- Space property rights - attempt at legal recognition for a claim to the asteroid Eros.
- http://www.erosproject.com/

The Colony Fund
- Public venture capital fund for the space entreprenurial sector
- http://www.colonyfund.com/