Helac-nlo
  Based on the OPP technique and the HELAC framework, HELAC-1LOOP is a program that is capable of numerically evaluating QCD virtual corrections to scattering amplitudes. A detailed presentation of the algorithm is given, along with instructions to run the code and benchmark results. The program is part of the HELAC-NLO framework that allows for a complete evaluation of QCD NLO corrections. 
G. Bevilacqua, M. Czakon, M. V. Garzelli, A. van Hameren, A. Kardos,   C. G. Papadopoulos, R. Pittau, M. Worek
hep-ph hep-ex