Experimental Rocket Propulsion Society - A LEO launcher development by a group of space enthusiast. Features engine and vehicle designs, project descriptions and membership information.

Hypersonic Waveriders - Hypersonic flow theory and applications to waveriders and other hypersonic flight vehicles.
Meta Description: [ Hypersonic flow theory and applications to waveriders and other hypersonic flight vehicles. ]

LiftPort - The Space Elevator Company - Offering information and project documents by a company aiming to construct space elevators.
Meta Description: [ LiftPort Group of Space Elevator Companies - Building the world's first Space Elevator - Site includes information about carbon nanotubes, robotics, and the space elevator. ]

Nasa X-Planes - Provides a centralized location for information on NASA X-aircraft. Also provides links to photos, fact sheets, line drawings and movie clips.

Rotational Slingshot Catapult - Provides a space enthusiast's view of the possibility to use alternative means for propulsion of spacecraft.
Meta Description: [ RSC - the Rotational Slingshot Catapult, a large rotating ring structure able to shoot lightweight objects like mini spacecraft, micro satellites and mini- or micro solar sails through space ]

Sky Ramp Technology - Information on sky ramp technology and its applications.

Space Launcher: Pylon Turn Wing Concept - An hypothetical alternative space launch system.

StarClimber Space Elevator Team - Official web site of the StarClimber Team, developing a space elevator prototype for entry in NASA/Spaceward.org's Climber Competition.
Meta Description: [ Official web site of the StarClimber Team, developing a Stirling engine powered space elevator prototype for entry in NASA/Spaceward.org's Climber Competition. ]