GRTensorJ - Books is an active interface to part of the computer algebra systems GRTensorII (for Maple) and GRTensorM (for Mathematica). It contains the Java interface GRTensorJ updated by Kamen Angelov. The intent is to provide students of general relativity with an advanced programmable calculator-style tool for evaluating all standard functions and reducing them to "elementary functions". This is not a traditional database. The database entries are spacetimes and calculations are done in real time as you wait.

Examples of the program's interface:
Maple
Mathematica

The current GRTensorJ - Books covers every spacetime in the following texts (in notation as close as possible to the text):

Carroll, Sean. Spacetime and Geometry: An Introduction to General Relativity. Addison Wesley (San Francisco), 2004. ISBN 0-8053-8732-3 (link)

d'Inverno, Ray. Introducing Einstein's Relativity. Clarendon Press (Oxford), 1992. ISBN 0-19-859686-3

Hartle, James. Gravity: An Introduction to Einstein's General Relativity. Addison Wesley (San Francisco), 2003. ISBN 0-8053-8662-9 (link)

Hawking, Stephen, and G.F.R. Ellis. The Large Scale Structure of Spacetime. Cambridge University Press (Cambridge), 1973. ISBN 0-521-09906-4

Misner, Charles, Kip Thorne and John Wheeler. Gravitation. W.H. Freeman and Co. (San Francisco), 1973. ISBN 0-7167-0344-0

Poisson, Eric. A Relativist's Toolkit: The Mathematics of Black-Hole Mechanics. Cambridge University Press (Cambridge), 2004. ISBN 0-521-83091-5 (link)

Rindler, Wolfgang. Relativity: Special, General and Cosmological. Oxford University Press (Oxford), 2001. ISBN 0-19-850836-0

Schutz, Bernard. A First Course in General Relativity. Cambridge University Press (Cambridge), 1990. ISBN 0-521-27703-5

Wald, Robert. General Relativity. University of Chicago Press (Chicago), 1984. ISBN 0-226-87033-2

Weinberg, Steven. Gravitation and Cosmology: Principles and Applications of the General Theory of Relativity. John Wiley and Sons (New York), 1972. ISBN 0-471-92567-5

In order to run this package, your computer must have either Maple or Mathematica installed.
You do not need to have GRTensor already installed. Your computer must also support Java.