- 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.
- Interstellar Missions - Provides news and information on interstellar propulsion technology and extrasolar discoveries provided by universities, organisations and companies.
- 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).
