Rivet is a Python and C++ framework for Monte Carlo event generator validation. It is built on the dual concepts of Analyses – routines which implement published experiment analyses – and Projections – routines which compute observables from MC event records. Rivet is designed to be efficient via automatic caching of projection results for each event, and very "physicist friendly" with analysis codes containing minimal boilerplate code and maximum physics.

For more information, please see the documentation at https://rivet.hepforge.org/