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

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

High Power Rocketry  
   This site answers the question: What is high power rocketry?
   http://www.mixi.net/~bobhart/scam/hpr.html

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

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

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

Experimental Rocket Propulsion Society  
   The Bay Area's Non-profit Liquid Fuel Rocket Engine Design and Test Team.
   http://www.erps.org/

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

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

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

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/

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/

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/

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/

The Civilian Space Exploration Team  
   Images and news from a rocket building private association aiming to launch the first amateur built rocket into space.
   http://www.civilianspace.com/

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

Ben's Chemical Propulsion  
   Tutorials on amateur experimental rocketry, along with videos, launch reports, and pictures.
   http://wildmanben.tripod.com/psite/index.html

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

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

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

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

vk2zay's website  
   Experimental rocketry with small devices.
   http://www.vk2zay.net/

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