List of QM datasets of optimized geometries and 1D torsion scans, curated and used for training one or more of the force fields discussed here, as referenced on MolSSI's publicly accessible repository QCArchive. As discussed above, Generation 1 datasets were the first set generated with coverage of all parameters as the main objective, whereas Generation 2 datasets were generated to increase the chemical diversity. Hessian datasets (termed as "Basic Dataset") for the equilibrium geometries of all the Optimization datasets listed here are also available on QCArchive. Each of the Hessian data sets has the exact same dataset name as the corresponding optimization dataset but Hessians for the final optimized geometries. A complete list of OpenFF datasets, including those not used in fitting here, can be found at: .