Armadillo Aerospace

AVG Anti-Virus (Free Edition)

Canadian Arrow

Dimensionality

Eurokot (Rokot)

European Space Agency

Laingholm On The Launchpad

Lunar Coalition

Lunar Coalition Yahoo Group

Mars Foundation

Mars Society

Moon Society

RSC Energia

Russian Aviation and Space Agency

Sea Launch (aka Boeing)

Scaled Composites (Winner of the X Prize)

SMART-1

Also http://www.esa.int/SPECIALS/SMART-1/index.html

Starchaser

Starsem (The Soyuz Company)

X Prize