SFGen provides a publicly available tool for lepton pair production and lepton-lepton scattering within the structure approach, including initial-state γ, Z and mixed Z/γ +q contributions. Arbitrary distributions and unweighted events can be generated, and errors due to the experimental uncertainty on the structure function (the equivalent of PDF uncertainties in the photon PDF framework) can be calculated on-the-fly.

A list of references can be round here and the code is available here.