- Aerospaceguide.net (Space projects and info)
- Association of Space Explorers
- Astrobiology Magazine
- Astro Expo (Space, Aerospace industry news and company/supplier information)
- Aspire Space website (UK amateur rocketry)
- Association in Scotland to Research into Astronautics (ASTRA) - UK Astronautics group
- Astro Info Service
- British Interplanetary Society
- British Rockets and Satellite Launchers
- Central Coast Space Frontier Society (Australia)
- CYGO (Asteroid mining, space news, etc.)
- DLR Web Portal (Germany)
- Euro Space Centre (Educational)
- Europe Model Rocketry
- Global Space League
- Hobbyspace (News Site)
- Livermore Unit National Association of Rocketry
- MARS Advanced Rocketry Society
- Mars Society
- Mars Society UK
- Mars Society of Australia
- Mars Sim (Simulation)
- Midlands Spaceflight Society
- Moonminer
- National Space Society (USA)
- National Space Society of Australia
- Orbital Engineering (small-scale rocket vehicle construction)
- Orbital Report News Agency
- Planetary Society
- ProSpace
- Rocket Man Blog (Informed discussion)
- Rocket Science Institute (Experimental rocketry)
- Rockets at the University of Hertfordshire
- Space Access Society
- Space Age
- Space.Com (News site)
- Space Connections (Space education)
- Space Daily (News site)
- Space Education Trust (UK)
- Spaceflight Now (News)
- Spaceflight Propulsion (Collection of articles)
- Space Frontier Foundation
- Space Future (promoting space tourism)
- Space Gear
- Space Guard UK Portal
- Space Politics
- Space Projects (News/"Watchdog" service)
- Space Ref (News site)
- Space Review (The) (Review articles)
- Space Science Institute
- Space Studies Institute
- Space Today (News site)
- Space Transportation Association (Big site, lots of links, very useful for reference)
- Spacetopia (Japanese)
- Spaceweek International Association
- Students for the Exploration and Development of Space
- SWARM -South West Amateur Rocketry Membership (UK)
- The Enterprise Mission
- The Space Show (News site)
- United Kingdom Rocketry Association
- Universe Today (News site)
- VStarnet News & Discussions)
- United Kingdom Students for the Exploration and Development of Space (UK SEDS)
- Uranos, the club for expansion of civilisation into space (Poland)
- World Spaceflight News (An AOL site)
- X-Prize Foundation