CompHEP - Package for evaluation of Feynman diagrams, integration over multi-particle phase space and event generation. FeynArts - Mathematica package for generation and visualization of Feynman diagrams and amplitudes. Monte Carlo Number Scheme - MC particle numbering convention, endorsed by the Particle Data Group. FeynCalc - Mathematica package for algebraic calculations in elementary particle physics, focusing on Feynman diagram calculations. The ROOT System - An object oriented framework for large scale data analysis. ROOT is a C++ replacement of the popular PAW program developed at CERN. cfortran.h - Interfacing C/C++ and FORTRAN - cfortran.h is a single header file that allows you to easily use fortran code in c and c++. Very useful for using HBOOK and other CERNLIB code in new c++ applications. Texsis - TeX Macros for Physicists - This package provides a number of useful features for typesetting research papers. It is an extension to Plain Tex. FLUKA (Fluktuierende Kaskade) - A stand-alone particle physics Monte-Carlo simulation package. It is being used as a simulation tool in a number of experiments. PYTHIA (and JETSET) - An event generator for a large number of physics processes. The site contains the latest source, the official manual and a short write-up describing PYTHIA's status with respect to the physics. Pandora - A physics event generator for linear collider studies. It includes beamstrahlung, initial state radiation, hadronization, and full treatment of polarization effects. FeynDiagram.com - Free C++ library for drawing Feynman diagrams. The output is in PostScript, which can be used in TeX or printed directly. Povama - Persint OpenGL Visualization for ATLAS Muon Analysis. Software used to visualize the reconstruction of muon traces. AcerMC Monte Carlo Generator - The AcerMC Monte-Carlo event generator is dedicated for generation of the Standard Model background processes in pp collisions at the LHC. Elementary Particles Simulation - Elementary Particles Simulation using Java Technology.An application made for educational purposes. FeynFig - FeynFig is a program to generate feynman diagrams in xfig format. Feynmf - Drawing Feynman diagrams with LaTeX and Metafont. FreeHEP - Virtual organization involved in the development of open-source software for data analysis and visualization, primarily for use in high energy, nuclear and astro- physics.