Some useful "NLO" links...

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• NLO MC codes with Parton Showers/Hadronization
  • MC@NLO
  • POWHEG Box

• Multi-purpose matrix-element-based parton-level-event generators:

  • Alpgen
  • MadGraph : Web interface, code download and Wiki
  • HELAC
  • WHIZARD

• Tools to compute amplitudes at one loop
  • CutTools
  • Samurai
  • Golem
  • GoSam

• One loop scalar integral libraries
  • QCDLoop
  • OneLOop
  • LoopTools

• Parton Shower and Hadronization codes
  • Pythia
  • HERWIG and HERWIG++
  • Sherpa

• Selected public NLO codes
  • MCFM