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Questions asking "What is a good book about X?" or more generally, "What should I read to learn about X?", typically where there is not a single authoritative reference. Please READ THE GUIDANCE IN META (http://meta.physics.stackexchange.com/questions/4697 or click Learn More) before asking.
3
votes
General Relativity visualization software
For particle/light motion in 2D space, my nomination would be GROrbits
It's free and requires a JVM to run, there is also a web start version for the brave ;)
Sorry but I've never found anything ai …
10
votes
Open source computer algebra systems for general relativity
There are only two open source GR/tensor packages that I am aware of, Cadabra (coordinate-free) and Maxima/xwMaxima (coordinate based, ctensor, itensor and atensor packages)
13
votes
Kerr metric Christoffel symbols
They are listed in here catalogue of spacetimes