Mars Desert Research Station
- Simulated Mars habitat in Utah desert, from the Mars Society
- http://www.marssociety.org/mdrs/

The Caves of Mars
- NIAC study on using natural subsurface formations on Mars for human habitation and radiation protection.
- http://www.highmars.org/niac/

Mars Colony - sponsored by the Martian Federation
- A venture to establish a privately funded colony on Mars.
- http://www.interzonga.com/martianfederation/welcome.htm

I'm Going to Mars
- Book reviews, movie reviews, images, and links relating to human missions to Mars.
- http://www.imgoingtomars.com

MarsHome.org
- The Mars Homestead Project - building the first permanent settlement on Mars utilizing local materials.
- http://marshome.org/

Martian Soil
- Daily weblog covering all the latest news in international Planet Mars exploration efforts.
- http://www.martiansoil.com/

Martian Time
- Everything about keeping time on Mars. Over 80 Martian calendars and over 40 Martian clock systems.
- http://pweb.jps.net/~tgangale/mars/

Human Habitats at Mars: Defending Against Contamination
- Detailed news report on how proponents of human settlements on Mars defend themselves against charges of contaminating what's possibly already thriving there.
- http://www.space.com/scienceastronomy/solarsystem/mars_terraform_010904-1.html

Mars Colonization
- Information from the Astrobiology Web about how and why Mars might be colonized.
- http://www.ibiblio.org/astrobiology/index.php?page=mars03

The Economic Viability of Mars Colonization
- A paper by Robert Zubrin.
- http://www.aleph.se/Trans/Tech/Space/mars.html

The Case for Mars VI
- International Conference for the Exploration and Colonization of Mars
- http://spot.colorado.edu/~marscase/Home.html

West to Mars
- An inspirational site devoted to pioneering on Mars.
- http://www.marswest.org

New Mars: A Journal of the Martian Frontier
- Published by the Mars Society; its archives contain significant articles on the rationale of colonization.
- http://www.newmars.com

The Mars Millennium Project
- An official White House Millennium Council youth project challenging students across the nation to design a community for the planet Mars.
- http://www.mars2030.net/