From Svenleyffer

A collection of mixed-integer nonlinear optimization problems from academia and applications. The problems are written in the modeling language AMPL.

A collection of Mathematical Programs with Equilibrium Constraints (MPEC) test problems in AMPL. The problems are largely academic with some small application examples.

A small collection or equilibrium problems with equilibrium constraints (EPECs). All models are written in AMPL.

A small collection of multi-objective optimization problems (MOOPs). The problems are written in AMPL and formulated as multi-objective problems and also as MPECs that compute an optimal approximation of the Pareto surface.