Project Summary
Force Field X (FFX) is a group of open source (GPL v. 3 with Linking Exception), platform independent modules for molecular biophysics. Key methods include:
1) Atomic Multipole Optimized Energetics for Biomolecular Applications (AMOEBA) force fields
2) Particle-mesh Ewald (PME) electrostatics with support for space group symmetry
3) Generalized Kirkwood continuum electrostatics
4) Single and Dual-Topology Orthogonal Space Random Walk (OSRW) free energy methods
5) L-BFGS, Simulated Annealing and Dead-End Elimination optimization algorithms
6) Reciprocal space refinement for X-ray and Neutron Diffraction data sets
7) Real space refinement for X-ray Diffraction, Neutron Diffraction and CryoEM data sets
8) Shared memory, cluster parallel and coprocessor based parallelization strategies
In a Nutshell, Force Field X...
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has a well established, mature codebase
maintained by a average size development team
with decreasing Y-O-Y commits -
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took an estimated 105 years of effort (COCOMO model)
starting with its first commit in December, 2009
ending with its most recent commit 11 days ago
Quick Reference
GPL + Classpath Exception
Permitted
Commercial Use
Modify
Distribute
Place Warranty
Use Patent Claims
Forbidden
Sub-License
Hold Liable
Required
Distribute Original
Disclose Source
Include Copyright
State Changes
Include License
Include Install Instructions
These details are provided for information only. No information here is legal advice and should not be used as such.
This Project has No vulnerabilities Reported Against it
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30 Day SummaryAug 30 2026 — Sep 29 2026
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12 Month SummarySep 29 2025 — Sep 29 2026
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