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

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/

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

SPASE News

SPASE is a UK high power rocketry team aiming to launch a rocket in to space.
http://www.spase.org/news.php?output=rss