Mathematica package for supergravity and string theory I am looking for a Mathematica package that can manipulate tensors for supergravity, string theory or M-theory. I am particularly looking for a package that can do spinor and Clifford algebra computations. Also, I would like this package to be able to do wedge and hodge dual, and other computation relating to forms. Can anyone suggest a specific one? I looked for atlas2, but it seems I have to pay to use it without a trial version.
 A: For Mathematica the best I know is RGTC. I Used it a long time ago (briefly) for a calculation in IIA SUGRA in 10 dimensions. It calculate gravitational tensors, manages differential forms (also Lie algebra valued ones), calculates Hodge dualities, etc.

Personal comment: If you are more intrepid (and FLOSS lover), there is a software called SAGE, which now has a (still developing) package (sagemanifold) for differential geometry calculations... it allows the use of differential form, etc.
A: As part of the sympy computer algebra system there are geometric (clifford) algebra modules. The latest can be found in my fork of sympy at
https://github.com/brombo/sympy
Their is a latex doc in the repository at sympy/doc/src/modules/galgebra/pdf/GA.pdf
Various examples are in sympy/examples/galgebra (especially look at the latex examples).
In the geometric algebra module the user defines the metric orthogonal of non-orthognal. Differential operators of multivectors are implemented.  I am will to help anyone who wishes to use the package.
