GaGaRes: A Monte Carlo generator for resonance production in two-photon physics. A new Monte Carlo generator, GaGaRes, is presented. The Monte Carlo generator describes two-photon production of resonances in e+e− collisions. The dependence on the photon virtualities Qi2 is fully taken into account. The program also generates the density matrices corresponding to the resonance production process. These density matrices are an essential tool for the description of the decay of the resonance. Some results of the MC will be given.