CERN Computing Documentation - Provides CERNLIB documentation. Also provides tutorials, FAQs, newsletters and reference cards for a wide range of software.
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.
Fermitools - The Fermilab Software Tools Program (Fermitools) aims to provide useful tools to the community. A wide range of tools are available, and all are free.
FeynArts - Mathematica package for generation and visualization of Feynman diagrams and amplitudes.
FeynCalc - Mathematica package for algebraic calculations in elementary particle physics, focusing on Feynman diagram calculations.
FeynDiagram.com - Free C++ library for drawing Feynman diagrams. The output is in PostScript, which can be used in TeX or printed directly.
Feynmf - Drawing Feynman diagrams with LaTeX and Metafont.
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.
FreeHEP - Software and information about software which is useful in high energy physics and related fields.
HEPpc - Linux resources for high energy physics, includes low traffic mailing list.
HERWIG - A Monte Carlo package for simulating hadron emission reactions with interfering gluons. Also contains a list of some "competitor" generators.
Povama - Persint OpenGL Visualization for ATLAS Muon Analysis. Software used to visualize the reconstruction of muon traces.
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.
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.
StdHep - Provides a common output format for Monte Carlo events so that event generators and other simulators can easily be compared. It also provides a set of routines which convert Herwig, Jetset, Isajet, or QQ events to and from the standard HEP event format.