- NASA Jet Propulsion Laboratory@
- American Antigravity
 - Developing lifter technology; an experimental form of Field-Effect Propulsion being investigated for commercial transportation and payload delivery. applications - From Stargazers to Starships
- Deals with the world of gravity: of massive planets and stars, and the way spaceflight is achieved despite their strong pull. Topics include astronomy of the Earth's motion in space and Newtonian mechanics.
- Electric Propulsion and Plasma Dynamics Laboratory
- Site facilitates communication and collaboration among the eight research sites participating in electric propulsion research under AFOSR sponsorship.
- University of Florida - Innovative Nuclear Space Power and Propulsion Institute
- INSPI conducts research related to space nuclear energy systems, high-temperature nuclear fuels and materials, energy conversion, and propulsion.
- Goddard, Robert H. (1882-1945) (4)
- Rocket Science 101
- Interactive NASA feature lets you "assemble" a Delta II or an Atlas V rocket. Learn about the basic parts of these launch vehicles, how they are configured, and how they work together with NASA spacecraft.
- Rocket Guy
- His goal is to go straight up 30 miles to set the altitude record for a private citizen. Includes photos of the project's progress and animation of the planned flight.
- Manned Missions to Mars
- Manned missions to Mars, Jupiter, Saturn, and all the outer planets are now possible thanks to a newly developed propulsion system.
- Institute of Space and Astronautical Science (Japan) - Propulsion System Laboratory
- Information on the ATREX expander cycle air-turbo ramjet engine, a candidate for the propulsion system of the fly back booster of the TSTO spaceplane.
- von Braun, Wernher (1912-1977)@
- NASA Breakthrough Propulsion Physics Program
- Seeks to discover ways to make interstellar flight possible.
- My Jet Engine Projects
- How to build your own pulsejet or turbojet engine.
- Whittle, Frank (1907-1996)@
- HowStuffWorks: How Air-breathing Rockets Will Work
- Explains the concept behind rocket-based, combined cycle engines, including scramjets.
- Fuelling Interplanetary Travel
- Takes a look at the traditional and new propulsion technologies needed for space exploration. Also covers the basic concepts involved with interplanetary travel.
- University of Alabama at Huntsville - Propulsion Research Center@
 Theory for Gravitic Propulsion
- Discusses a theoretical method of propulsion, matter, energy, and gravitic effect.
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