Golem95C: A library for one-loop integrals with complex masses
  We present a program for the numerical evaluation of scalar integrals and tensor form factors entering the calculation of one-loop amplitudes which supports the use of complex masses in the loop integrals. The program is built on an earlier version of the golem95 library, which performs the reduction to a certain set of basis integrals using a formalism where inverse Gram determinants can be avoided. It can be used to calculate one-loop amplitudes with arbitrary masses in an algebraic approach as well as in the context of a unitarity-inspired numerical reconstruction of the integrand. 
G.Cullen, J.-Ph.Guillet, G.Heinrich, T.Kleinschmidt, E.Pilon,   T.Reiter, M.Rodgers
hep-ph