Software for calculating Feynman diagrams

[Carlos L. Janer]

I'd appreciate it very much if someone told me if there is any free software to (draw and) calculate the amplitudes of simple (tree and one loop) Feynman diagrams.

I'm hesitating because I don't know if this is the right place to ask. If it's not, I apologize in advance.

 

[Orodruin]

Have you tried the FeynArts and FeynCalc Mathematica packages?

Edit: The packages are free. Of course, Mathematica isn't (it is free for you if your university had student/employee licences - but then your university is paying).

 

[Carlos L. Janer]

No I haven't, but I will.Thanks for the tip!