Open Force Field Software
The Open Force Field Initiative is creating molecular mechanics force fields for simulation of large biomolecular systems, and the tools to use them easily and accurately. OpenFF force fields are optimized automatically and in the open, with open source tools, from open source datasets. We assign parameters directly to chemical graphs without the intermediate step of assigning atom types, and we can export parametrized systems to a host of simulation engines.
Getting Started
Instructions for installing and using OpenFF software can be found at Installation and in the project-specific documentation below. If you want to understand how to use OpenFF force fields, or if you want to see what’s possible, see Modelling with OpenFF or the Examples.
Standards
Specifications for SMIRNOFF and other standards defined by OpenFF can be found at OpenFF Standards.
Projects
openff-toolkitTools for preparing systems and manipulating force fields
openff-interchangeParametrize and export systems ready for simulation to various MD engines
openff-unitsUnified units of measure handling for the OpenFF ecosystem based on Pint
openff-bespokefitAutomated parameter optimization for specific molecules or series of molecules
openff-qcsubmitSubmit and retrieve datasets with rich metadata from QCFractal instances
openff-fragmenterFragment molecules for efficient quantum mechanical torsion scans
openff-evaluatorScalably and automatically estimate physical properties
openff-rechargeGenerate optimized partial charges for molecules with a variety of methods
openff-naglTrain and use machine-learned partial charge models targetting molecular graphs
Contact Us
Need help? Raise an issue on GitHub, open a discussion on OpenFF Discussions, or email us!