Feynmf
- Drawing Feynman diagrams with LaTeX and Metafont.
- http://xml.web.cern.ch/XML/textproc/feynmf.html

Hanna
- A C-based Analysis Tool for the HERMES experiment at the DESY laboratory in Hamburg, Germany.
- http://hermes.desy.de/hanna/

FeynFig
- FeynFig is a program to generate feynman diagrams in xfig format.
- http://www.lpthe.jussieu.fr/~salam/feynfig/

JaxoDraw
- A Java program for the interactive drawing of Feynman diagrams
- http://altair.ific.uv.es/~JaxoDraw/

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.
- http://borut.home.cern.ch/borut/

Povama
- Persint OpenGL Visualization for ATLAS Muon Analysis. Software used to visualize the reconstruction of muon traces.
- http://povama.sourceforge.net

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.
- http://www-cpd.fnal.gov/psm/stdhep/

FeynDiagram.com
- Free C++ library for drawing Feynman diagrams. The output is in PostScript, which can be used in TeX or printed directly.
- http://feyndiagram.com/

HERWIG
- A Monte Carlo package for simulating hadron emission reactions with interfering gluons. Also contains a list of some "competitor" generators.
- http://hepwww.rl.ac.uk/theory/seymour/herwig/

Pandora
- A physics event generator for linear collider studies. It includes beamstrahlung, initial state radiation, hadronization, and full treatment of polarization effects.
- http://www-sldnt.slac.stanford.edu/nld/new/Docs/Generators/PANDORA.htm

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.
- http://www.thep.lu.se/~torbjorn/Pythia.html

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.
- http://fermitools.fnal.gov/

CERN Computing Documentation
- Provides CERNLIB documentation. Also provides tutorials, FAQs, newsletters and reference cards for a wide range of software.
- http://consult.cern.ch/service/documentation/

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.
- http://www.fluka.org

Texsis - TeX Macros for Physicists
- This package provides a number of useful features for typesetting research papers. It is an extension to Plain Tex.
- http://www.texsis.org/

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.
- http://www-zeus.desy.de/~burow/cfortran/

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.
- http://root.cern.ch/

FeynCalc
- Mathematica package for algebraic calculations in elementary particle physics, focusing on Feynman diagram calculations.
- http://www.feyncalc.org/

Phi (Phenomenology of Hadronic Interactions)
- Extension of the Mathematica packages, FeynCalc and FeynArts.
- http://www.feyncalc.org/phi/

The CalcHEP and CompHEP Projects
- Two Tools designed to calculate cross sections in high energy physics.
- http://www.ifh.de/~pukhov/

Software and Tools
- List at HEPIC.
- http://www.hep.net/resources/software.html

Monte Carlo Number Scheme
- MC particle numbering convention, endorsed by the Particle Data Group.
- http://pdg.lbl.gov/mc_particle_id_contents.html

FeynArts
- Mathematica package for generation and visualization of Feynman diagrams and amplitudes.
- http://www.feynarts.de/

FreeHEP
- Software and information about software which is useful in high energy physics and related fields.
- http://heplibw3.slac.stanford.edu/FIND/FHMAIN.html