Best Mathematica Tensor/General Relativity Package?

[xdrgnh]

Hello can anyone recommend me a good mathematics package for solving the Einstein Field equations. You know one that can easily compute covariant derivatives and calculate the Reinman curvature tensor and can also minimize the einstein Hilbert Action?

 

[MinasKar]

You should try this one:
http://library.wolfram.com/infocenter/MathSource/8848/

Though I'm not sure if it has all the features that you want.

 

[Ravi Mohan]

You might also want to check xAct http://www.xact.es.
A very good example is given here https://github.com/xAct-contrib/examples