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I have recently completed, together with Alex Hsieh, a set of packages for performing calculations common in High-Energy Physics, using Mathematica. Specifically, we have written the following packages: NonCommutativeMultiply.m - General utilities for working with non-commutative algebras: declaring objects as non-commutative, automatically factoring out the commuting variables, manually commuting specific objects, and more. RelativisticKinematics.m - Working with four-vectors: constructing four-vectors, extracting invariant mass, energy and momentum from a four-vector, calculating the dot-product of two four-vectors, boosting a four-vector in an arbitrary direction, decaying a four-vector into two four-vectors, working with Mandelstam variables and more. All operations can be done both symbolically and numerically. Spinor.m - Working with Dirac Algebra and Lorentz indices: The space-time metric g, contructing over Lorentz indices, working with spinors U, Ubar, V and Vbar, squaring expressions with spinors to give traces over gamma-matrices, evaluating traces over gamma- matrices in arbitrary space-time dimension and more. CrossSection.m - Automatically evaluating cross-sections and decay- widths from a matrix element squared by constructing the necessary phase-space integrals, and optionally evaluating them. Evaluation can be either symbolic or numeric. Class.m - A very general implementation of some object- oriented programming tools: classes, properties and inheritance. StandardModel.m - A compilation of the Feyman rules of the Standard- Model, together with other useful facts. These packages, together with a small number of sample calculations are now available for beta testing. If you are interested, write to me. Pease indicate explicitly if you are NOT using a Unix-based system.