Tensor Mangling Software

[pervect]

What sort of software do people here like to use to mangle, errr I mean manipulate, Tensors in General Relativity?

[robphy]

I use paper and pencil. :smile:

A while back, I heard that MathTensor is good (but expensive).

It seems lots of tensor software packages are used for calculating components. I'd be interested in one that helps me manipulates them abstractly (for example, calculations involving algebraic and differential identities satisfied by the Riemann and Weyl tensors).

You may have seen this list
http://math.ucr.edu/home/baez/RelWWW/software.html

[pervect]

I use paper and pencil. :smile:

A while back, I heard that MathTensor is good (but expensive).

It seems lots of tensor software packages are used for calculating components. I'd be interested in one that helps me manipulates them abstractly (for example, calculations involving algebraic and differential identities satisfied by the Riemann and Weyl tensors).

You may have seen this list
http://math.ucr.edu/home/baez/RelWWW/software.html

I probably did read that list at one time - currently, I'm reasonably happy with Maple and GRTensorII, but I was wondering what other people here used.