Earth-to-Orbit Transportation Bibliography: A look at the various propulsion technologies that could be used to provide cheap transport into orbit.
HobbySpace - Launch, Propulsion & Spaceflight Systems: Looks at the many types of launch vehicles and propulsion technologies that are in service or proposed.
How Space Exploration Will Work: Illustrated narrative shows a number of advanced space concepts.
Interstellar Missions: News on advanced propulsion technologies for space travel from universtites, organisations and companies.
List of Space Propulsion Methods: Attempts to list all known space propulsion methods.
Solar-Thruster-Sailor: Solar Sail with hybrid propulsion, using light pressure and ion thruster to produce thrust. Spacecraft Building System to build large, light weight space structures in a fast and simple way.
Swiss Propulsion Laboratory: Aims to develop systems to transport small civilian payloads into a low-earth orbit (LEO).
The Sunflower Project: A proposed space transportation system which consists of two parts: rotocrane moving in an atmosphere only, and sunflower moving in a space plasma. Description of the theory and state of development.