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. Jetex Engineering Works - Reference resources about Jetex and Jet-X micro rocket motors and propellants, plus gas generator experiments and propellant development projects RRS - The Reaction Research Society is the oldest continuously operating amateur experimental rocket group in the United States. National Association of Rocketry - The NAR is the oldest and largest sport rocketry organization in the world. 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. AeroPac's - "Association of Experimental Rocketry of the Pacific" organizes regular high power rocket launches in Northern California and Nevada. Pacific Rocket Society - An experimental rocket society, dedicated to liquid propulsion research. International Experimental Aerospace Society - A knowledge base containing information on experimental rocketry, regulations of various countries, and information on grant opportunities. Richard Nakka's Experimental Rocketry - General information on what amateur experimental rocketry involves, and considerable specific information on motor and rocket design. CTRA-NARCONN - Connecticut Tripoli and National Association of Rocketry. Lists launch information, recent launch photos, contact information or member application. Systeme Solaire - Information on how to build the SS67B-1 liquid propellant rocket engine. Ben's Chemical Propulsion - Tutorials on amateur experimental rocketry, along with videos, launch reports, and pictures. Digital Wireless Firing Systems - Digital electronic firing systems for the model rocket enthusiast. Designing Rocket Motors - Publications, articles, software and discussion groups about chemical rocket motors. aRocket - Resources for amateur and experimental rocketeers. Vlaamse Raket Organisatie - The Flemish Rocket Organization aims to promote rocket related sciences, including research into motors and propellants, flight electronics, and the design, constructing, testing and launching of rockets. English and Dutch.