QMW Hyperspace  
   A set of hypertext based services for general relativity research provided by the QMW Relativity group.
   http://www.maths.qmw.ac.uk/hyperspace/

Relativity bookmarks  
   Rob Salgado's bookmarks
   http://physics.syr.edu/research/relativity/RELATIVITY.html

General Relativity Simulation Contest  
   The purpose of this Contest is to prove General Relativity using a (simple) algorithm.
   http://users.pandora.be/nicvroom/contest.htm

Relativity Forum  
   Forum devoted to discussing the Einstein's special and general theories of relativity.
   http://astronomyphysics.com/list.php?f=33

Ricci  
   A Mathematica package for doing tensor calculations in differential geometry and general relativity.
   http://www.math.washington.edu/~lee/Ricci/

NOVA Online/Einstein Revealed  
   Profile of Albert Einstein, with additional teaching resources, Shockwave demonstrations, and animations of relativity concepts.
   http://www.pbs.org/wgbh/nova/einstein/

Gravitational Lensing  
   A popular site with interactive demonstrations of gravitational lensing. The background material is at a graduate level
   http://www.iam.ubc.ca/~newbury/lenses/lenses.html

Shapiro Radar Bounce Test  
   A two part overview of the Shapiro radar bounce test of general relativity. (The two parts consist of a section for normal people, and one for nerds)
   http://world.std.com/~sweetser/PopScience/timeDelay/timeDelay.html

Hyperspace at the University of British Columbia  
   Includes links to online journals, news and preprint archives, as well as lists of faculty at this university.
   http://axion.physics.ubc.ca/hyperspace/

Southampton GR Explorer  
   An introduction to Einstein's theory of General Relativity and related topics. These pages include informative text, pictures and movies.
   http://www.maths.soton.ac.uk/relativity/GRExplorer/

Solving Einstein's Equations in Three Dimensions  
   This is a Mathematica notebook showing how to plot light cones in two plus one spacetime dimensions with a point mass.
   http://www.theory.caltech.edu/people/patricia/test/Einstein3.html#Einstein31

Interactive Experiments in Gravity  
   Try an experiment that illustrates the gravitational attraction between two objects or use a Java applet to understand how orbits work in strongly curved space-time.
   http://www.fourmilab.ch/gravitation/

Gravity Probe B  
   Gravity Probe B is the relativity gyroscope experiment being developed by NASA and Stanford University to test two extraordinary, unverified predictions of Albert Einstein's general theory of relativity.
   http://einstein.stanford.edu/

Physics Bookshelf - Relativity  
   A collection of articles about relativity
   http://www.upscale.utoronto.ca/GeneralInterest/Relativity.html

Gravity of Gravity  
   An experiment at the University of Washington seeks to determine whether the gravitational binding energy of an object generates gravity of its own.
   http://www.aip.org/enews/physnews/1999/split/pnu454-1.htm

The 5D Spacetime Consortium  
   We are a group of physicists and astronomers working on a 5-dimensional version of general relativity.
   http://astro.uwaterloo.ca/~wesson/#PUB

Derivation of gravitational waves in Einstein, Brans-Dicke and Rosen theories of gravity.  
   Mathematical derivation of gravitational waves to quadrupole order in the Brans-Dicke scalar-tensor and Rosen bi-metric theories of gravity.
   http://www.davis-inc.com/relativity

Gravitational Waves: An Introduction  
   This paper presents an elementary introduction to the theory of gravitational waves. This article is meant for students who have had an exposure to general relativity, but results from general relativity have been derived in the appendices.
   http://arxiv.org/abs/physics/9908041

Are There Pictorial Examples of Covariant and Contravariant Vectors  
   We present pictorial means of distinguishing contravariant vectors (or simply vectors) from covariant vectors (or linear forms).
   http://arxiv.org/abs/gr-qc/9807044

Handbook of Space Astronomy and Astrophysics - Relativity  
   A collection of equations important to both special relativity and general relativity.
   http://ads.harvard.edu/books/hsaa/chap10.html

An Essay on General Relativity  
   This site contains a comprehensive introduction to the basic ideas and tests of general relativity
   http://astro.physics.sc.edu/selfpacedunits/Unit57.html

The Special Theory of Relativity  
   Self-tutorial with short essays, questions and answers.
   http://astro.physics.sc.edu/selfpacedunits/Unit56.html

The Cosmological Constant  
   An overview of why Einstein added an extra term in general relativity, and why it is still examined.
   http://pancake.uchicago.edu/~carroll/encyc/

Experimental Gravitational Physics Using Drag-Free Satellites  
   Covers current and past projects in experimental gravitational physics using Drag-Free Satellites including the Relativity Gyro, Equivalence Principle, and LISA.
   http://www.dragfreesatellite.com

Relativity  
   Provides information on the history, experiments and paradoxes of relativity.
   http://www.nobel.se/physics/educational/relativity/

Publications in Physics and Mathematics by Walter Pfeifer  
   A textbook for relativistic quantum mechanics is presented. The Dirac equation is dealt with in detail.
   http://www.walterpfeifer.ch/

Why Time is Absolute, and Relative, But Never Universal  
   An article by Vincent Sauvé elaborating upon a materialist view of the absolute and relative nature of time.
   http://home.pacbell.net/skeptica/time.html

Mark Roberts Homepage  
   Useful information and links on relativity, quantum theory, and cognition.
   http://www.maths.surrey.ac.uk/personal/st/Mark.Roberts