Models and codes from the University of Maryland "Neuromechanics Research Core" for performing optimal control simulations of human movement with OpenSim Moco software. Currently we provide a 2-D version of the Rajagopal et al. (2016) model for performing simulations of walking, as well as a 3-D version with two intact limbs and a 3-D version with a unilateral transtibial prosthesis. Mean experimental data from Miller et al. (2014) are included for performing data-tracking simulations or as a basis of comparison for predictive simulations.