MadGraph / MadEvent is a software that allows you to generate amplitudes and events for any process (with up to 9 external particles) in any model. Implemented models are the Standard Model, Higgs effective couplings, MSSM, the general Two Higgs doublet model, and several minor models, and there is an easy-to-use interface for implementing model extensions. In connection with MG/ME there is also a range of tools, including a Pythia and PGS (detector simulation) package, a Root event analysis package, plotting packages, interfaces to other generators and file converters.

FeynCalc is a Mathematica package for algebraic calculations in elementary particle physics. http://www.feyncalc.org/

CalcHEP - a package for calculation of Feynman diagrams and integration over multi-particle phase space.

CompHEP: a package for evaluation of Feynman diagrams, integration over multi-particle phase space and event generation

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