Beyond Einstein
- http://universe.nasa.gov/
- Description of NASA's Beyond Einstein missions set to explore various consequences of general relativity - and possibly, as the name indicate, go beyond what Einstein's theory predicts. Includes educational resources.
Einstein Online
- http://www.einstein-online.info/en
- Information about Einstein's theories of special and general relativity and their applications; site is hosted by the Max Planck Institute for Gravitational Physics. Includes a simple introduction, a collection of articles ("Spotlights on relativity"), and a relativistic dictionary.
General Relativity Simulation Contest
- http://users.telenet.be/nicvroom/contest.htm
- Attempt at a content aimed at the Internet community to write a simulation program, based on a simple algorithm incorporating the laws of general relativity, that can realistically simulate the behavior of black holes, binary stars, and the twin paradox.
Interactive Geometric Database
- http://130.15.26.66/servlet/GRDB2.GRDBServlet
- Interactive database developed by Mustapha Ishak and Kayll Lake and hosted by Queen's University; allows the user to search for specific solutions of Einstein's field equations (that is, for specific model universes of general relativity).
Subtle is the Gravity
- http://arxiv.org/abs/gr-qc/0102009
- Review of the motivations for and basic principles of general relativity, aimed at a general audience. Written by Naresh Dadhich (IUCAA Pune), based on a lecture delivered in 2001.