Amateur and Ex Rocketry
- Information on motor construction, tooling and supplies.
- http://www.flyinspace.com

Amateur Experimental Rocketry
- Rocketry.Org maintains a large web database of suppliers for anything experimental rocketry enthusiasts could want, as well as a global rocketry organizations database and book lists.
- http://www.rocketry.org

Project Earth Crashlander
- The Chronicles of Experimental Rocketry. Contains several personal rocketry projects that go into detailed explanation that anyone starting in scratch-built rocketry might be interested in.
- http://celtickane.com/rocketry

aRocket
- Resources for amateur and experimental rocketeers.
- http://www.arocketry.net

Designing Rocket Motors
- Publications, articles, software and discussion groups about chemical rocket motors.
- http://www.chemroc.com/

Trailer Trash Aerospace
- A group of high-power and experimental rocket enthusiasts in the desert southwest building magnificent things with the thinnest of resources.
- http://www.trailertrashaerospace.com/

Digital Wireless Firing Systems
- Digital electronic firing systems for the model rocket enthusiast.
- http://www.holatron.com

Systeme Solaire
- Information on how to build the SS67B-1 liquid propellant rocket engine.
- http://home.total.net/~launch

CTRA-NARCONN
- Connecticut Tripoli and National Association of Rocketry. Lists launch information, recent launch photos, contact information or member application.
- http://www.ctra-narconn.org/

Richard Nakka's Experimental Rocketry
- General information on what amateur experimental rocketry involves, and considerable specific information on motor and rocket design.
- http://www.nakka-rocketry.net/

International Experimental Aerospace Society
- A knowledge base containing information on experimental rocketry, regulations of various countries, and information on grant opportunities.
- http://www.ieas.org/

Swiss Propulsion Laboratory
- SPL develops propulsion elements for sounding rockets like LOX valves, injectors, regeneratively cooled combustions chambers, igniters, propellant feeding systems and thrust test stands.
- http://www.spl.ch/

Pacific Rocket Society
- An experimental rocket society, dedicated to liquid propulsion research.
- http://www.translunar.org/prs

AeroPac's
- "Association of Experimental Rocketry of the Pacific" organizes regular high power rocket launches in Northern California and Nevada.
- http://www.aeropac.org/

Commonwealth Displays
- Rocketry site for project parts you need.
- http://www.commonwealth.net/rockets/cdi.html?

Tripoli
- Tripoli is a non-profit organization dedicated to the advancement and operation of non-professional high power rocketry. Tripoli has members in the United States and 20 countries around the world.
- http://www.tripoli.org/

Model Rocket Drag Analysis
- NAR R and D Report
- http://web.syr.edu/~smdemar/rocketdrag.html

National Association of Rocketry
- The NAR is the oldest and largest sport rocketry organization in the world.
- http://www.nar.org/

Blacksky
- Real rocket science. With references and design equations.
- http://www.blacksky.com/

RRS
- The Reaction Research Society is the oldest continuously operating amateur experimental rocket group in the United States.
- http://www.rrs.org

Jetex Engineering Works
- Reference resources about Jetex and Jet-X micro rocket motors and propellants, plus gas generator experiments and propellant development projects
- http://jetex.org