The first version of the new OpenFF started with SMIRNOFF99Frosst, consisting of direct chemical perception typing rules and parameters from the prior AMBER parm99 force field and Merck-Frosst's parm@frosst. Since then, nearly all of the 500 valence parameters have been optimized to improve agreement with quantum chemical optimized geometries, energetics, and vibrational frequencies. The first generation OpenFF 1.X ("Parsley") releases largely retained the Lennard-Jones and electrostatic parameters of SMIRNOFF99Frosst, whereas the more recent OpenFF 2.0.0 40 ("Sage") release refit Lennard-Jones parameters as well. The OpenFF Initiative includes the OpenFF Consortium, a pre-competitive, network of academic and industry researchers working together to advance the required science and infrastructure. The shared goal is to develop automated and systematic data-driven techniques to parameterize and assess new generations of the force field.