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Generic force field based on hybridization-dependent atom typing. Simple and broadly applicable with harmonic bonds, angles, and dihedrals.

Transferable Potentials for Phase Equilibria — United Atom. Coarse-grained force field optimized for vapor-liquid equilibria of hydrocarbons.

Polymer Consistent Force Field. Class 2 with quartic bonds/angles and extensive cross-term couplings. Designed for polymers and organic molecules.

Optimized Potentials for Liquid Simulations — All-Atom. Class 1 force field with geometric combining rules and OPLS-style 4-term Fourier dihedrals.

Modern SMIRNOFF force field from the Open Force Field Initiative. Uses AM1-BCC charges, Fourier dihedrals, and Lorentz-Berthelot combining rules.