  The program package GoSam is presented which aims at the automated
calculation of one-loop amplitudes for multi-particle processes. The amplitudes
are generated in terms of Feynman diagrams and can be reduced using either
D-dimensional integrand-level decomposition or tensor reduction, or a
combination of both. GoSam can be used to calculate one-loop corrections to
both QCD and electroweak theory, and model files for theories Beyond the
Standard Model can be linked as well. A standard interface to programs
calculating real radiation is also included. The flexibility of the program is
demonstrated by various examples.
