- CarpetCode - A mesh refinement driver for the Cactus code; the primary application is the simulation of black hole spacetimes.
- Cartan: A Mathematica Package for Tensor Analysis - Product information from Ad Infinitum AS about a package for use with the Mathematica software; allows interactive tensor calculations in spacetimes of arbitrary dimension.
- Form Symbolic Manipulation System - A free software package for manipulating tensors (abstract index notation) and other multi-component objects; highly suitable for calculations in general relativity and related theories such as supergravity. Documentation, course material, and possibilities for download.
- GRAVLENS - Software for modelling gravitational lens systems; created and maintained by Chuck Keeton at Rutgers University.
- GRTensorII - A computer algebra package for performing differential geometry calculations. Demonstrations of the package's applications to general relativity.
- LORENE (Langage Objet pour la RElativite NumeriquE) - Provides a set of C++ classes to solve various problems arising in numerical relativity and other areas of computational astrophysics.
- openGR - An open framework for large numerical simulations in general relativity.
- Ricci - A Mathematica package for doing tensor calculations in differential geometry and general relativity.
- Riemann Package for Maple - Package written in Maple for calculating tensor components in General Relativity and performing some abstract tensor manipulation; suitable for calculations in general relativity and for quantum field theory in curved spacetime. Features brief description, download for Maple V and for Maple 6 or higher, and examples.
- The Cactus Code - A modular manageable high-performance 3D tool for Numerical Relativity.
- Whisky - A code to evolve the equations of hydrodynamics in curved spacetime (relativistic numerical hydrodynamics).

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