Sherpa – Simulation of High-Energy Reactions of PArticles
https://sherpa.hepforge.org/trac/wiki

Sherpa is a Monte Carlo event generator for the Simulation of High-Energy Reactions of PArticles in lepton-lepton, lepton-photon, photon-photon, lepton-hadron and hadron-hadron collisions. Simulation programs – also dubbed event generators – like Sherpa are indispensable work horses for current particle physics phenomenology and are (at) the interface between theory and experiment. This will be added to the tools section of Research Resources Subject Tracer™ Information Blog.