Monte Carlo Programs
 
ARIADNE  A program for simulation of QCD cascades implementing the color dipole model. 
AROMA  Heavy quark production in boson-gluon fusion using full electroweak LO cross-sections (with quark masses) in ep collisions, DIS and photoproduction. Parton showers and Lund hadronization gives full events. 
DISENT  DISENT is a program for (1+1)- and (2+1)-jet events in deep inelastic scattering in NLO. 
DISASTER  DISASTER is a program for (1+1)- and (2+1)-jet events in deep inelastic scattering in NLO. 
DJANGO  Interface between HERACLES (QED corrections to order alpha_QED) and LEPTO/ARIADNE (QCD matrix elements and parton showers/colour dipole radiation) to give complete ep events. 
EPJPSI  EPJPSI is a program to simulate elastic and inelastic vector meson production in photo production and deep inelastic scattering. 
HERACLES  NC and CC ep interactions (using parameterizations of structure functions or parton densities) with radiative corrections: single photon emission from the lepton line, self energy corrections and the complete set of one-loop weak corrections can be included. 
HERWIG  General purpose generator for Hadron Emission Reactions With Interfering Gluons; based on matrix elements, parton showers and a cluster model for hadronization. 
HITVM  A Monte Carlo program of calculations of Forshaw and Ryskin for diffractive vector meson production using a gluon ladder in pQCD using BFKL formalism. 
JETSET  The Lund string model for hadronization of parton systems. 
JETVIP  NLO program for calculating one and two-jet cross sections for electron-protron and electron-positron collisions. The virtuality of the photon emitted by the electron can be chosen in a continuous region, ranging from on-shell photons (photoproduction) up to very large virtualities (deep-inelastic scattering region). The program enables to calculate the direct and resolved photon processes in NLO QCD. Special attention is given to the resolved virtual photon component. 
JBFKL  A Monte Carlo generator for J/psi meson production by off-shell gluons (get the program source here). 
LDCMC  A program which implements the Linked Dipole Chain (LDC) model for deeply inelastic scattering within the framework of ARIADNE. The LDC model is a reformulation of the CCFM model. 
LEPTO  Deep inelastic lepton-nucleon scattering based on LO electroweak cross sections (incl. lepton polarization), first order QCD matrix elements, parton showers and Lund hadronization giving complete events. Soft colour interaction model gives rapidity gap events. 
MAJOR  Production and decay of heavy Majorana neutrinos in ep collisions, via mixing or exchange of righthanded W-bosons. Parton showers and Lund hadronization added to give complete events. 
MEPJET NLO Monte Carlo program to study jet cross sections for arbitrary jet algorithms and arbitrary event shapes in deep inelastic e- p and e+ p scattering.
PHOJET  Multiparticle production in high energy hadron-hadron, photon-hadron, and photon-photon interactions (hadron = proton, antiproton, neutron, or pion). 
POMPYT  Diffractive hard scattering in pp, gamma-p and ep collisions, based on pomeron flux and pomeron parton densities (several options included). Also pion exchange is included. Parton showers and Lund hadronization to give complete events. 
PYTHIA  General purpose generator for e+e-, pp and ep-interactions, based on LO matrix elements, parton showers and Lund hadronization. 
RAPGAP  A full Monte Carlo suited to describe Deep Inelastic Scattering, including diffractive DIS and LO direct and resolved processes. 
RIDI  A Monte Carlo generator for inelastic diffraction dissociation of virtual photon in ep scattering, based on a model by M. Ryskin.Transverse and longitudinal cross sections are simulated. Processes implemented: ep -> epX with X = q+qbar or X = q+qbar+gluon. Fragmentation and parton shower done with JETSET. 

Programs for calculating diagrams:

COMPHEP  The CompHEP package was created for calculation of multiparticle final states in collision and decay processes. The main idea in CompHEP was to enable one to go directly from the Lagrangian to the cross sections and distributions effectively, with a high level of automation.
GRACE  Grace system. 
MadGraph  MadGraph automatically generates postscript Feynman diagrams and Fortran code to calculate arbitrary tree level helicity amplitudes by calling HELAS subroutines 

Tools:

HzTool  HzTool consists of a set of routines allowing to compare published (and some preliminary) HERA data to different Monte Carlo generator predictions. It was developed within the workshop `Future Physics at HERA'
PDFLIB  Nucleon, Pion and Photon Parton Density Functions and alpha(s) Calculations.