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Open Force Field

@openforcefield.org
101 followers 19 following 80 posts
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Open Force Field @openforcefield.org · 05/08/2026
It's exciting to see real users testing agentic workflows that make use of our models and tools. Thanks to the Biggin lab for publicizing these results and showing the work that still needs to be done!
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Cole Group @colegroupncl.bsky.social · 05/07/2026
If you're heading to #CCPBioSim2026 this week, watch out for posters by @finlayclark.bsky.social, João Morado & @asmaferiel.bsky.social describing their recent preprints. #compchem
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Open Force Field @openforcefield.org · 10/06/2026
OpenFF will be presenting a hands-on "getting started" session at the inaugural OMSF Stack Tour. Our first workshop will take place in San Francisco on Jun 24 at UCSF. All events are free to attend and please spread the word in your circles. luma.com/ju76rpzb
luma.com
OMSF Stack Tour: San Francisco · Luma
Spend a day trying the open-source stack for molecular modeling! The Open Molecular Software Foundation is organizing the first OMSF Stack Tour, and our first…
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Cole Group @colegroupncl.bsky.social · 02/06/2026
📢 New preprint: "Fast training of bespoke SMIRNOFF-format molecular mechanics force fields using machine learning potentials", by @finlayclark.bsky.social et al. chemrxiv.org/doi/full/10....
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Open Force Field @openforcefield.org · 12/05/2026
Have you read about our GNN model for assigning partial charges? It's at the heart of both our Sage 2.3.0 force field and the protein force field we're developing. The paper was published last month in JCTC. pubs.acs.org/doi/10.1021/...
pubs.acs.org
Developing and Benchmarking Sage 2.3.0 with the AshGC Neural Network Charge Model
Partial atomic charges are a fundamental component underlying classical molecular simulations, but assigning charges remains a computational bottleneck; many common methods rely on quantum mechanical ...
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Open Force Field @openforcefield.org · 04/05/2026
Both of our 2026 Virtual Workshops are now available on Youtube! One on how to use our new, pytorch-based fitting stack, and one on how to use our latest models to set up paramters for simulations. #opensource #compchem youtube.com/playlist?lis...
youtube.com
OFF Virtual Workshops (2026) - YouTube
Two training workshops presented by the Open Force Field Initiative in 2026, on how to use our tools and models.
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Open Force Field @openforcefield.org · 23/04/2026
We don't do our work in a vacuum, and neither do you. To learn how to set up simulations in solvent, check out this notebook exploring different methods for setting up a solvated system. docs.openforcefield.org/en/latest/ex...
docs.openforcefield.org
Methods for Topology solvation — OpenFF Ecosystem documentation
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Open Force Field @openforcefield.org · 21/04/2026
How does she do it all? Part of the answer is "by guiding a team of brilliant, hard-working scientists" but a surprisingly large part is "all by herself." And maybe with some help from Claude Code.
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Open Force Field @openforcefield.org · 21/04/2026
(Don't @ me if octane isn't actually one of the alkanes used as a fitting target in the lipids project. I didn't stop to check before posting.)
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Open Force Field @openforcefield.org · 21/04/2026
Our latest Science Update video is here, and it's a big one! Science Lead @lilyminium.bsky.social, in spite of a cough, delivers 25 minutes of non-stop scientific action and high-octane thrills across all our areas of force field science. youtu.be/ZIw2JlCfSso
youtu.be
April 2026 Science Update
YouTube video by Open Force Field Initiative
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Open Force Field @openforcefield.org · 17/04/2026
LOL
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Cole Group @colegroupncl.bsky.social · 09/04/2026
Passionate about force fields? Got great ideas for the future of force field design? We are looking to support applicants to the #MSCA Postdoctoral Fellowships scheme in collaboration with @openforcefield.org! Get in touch if interested! marie-sklodowska-curie-actions.ec.europa.eu/whats-new/ne...
marie-sklodowska-curie-actions.ec.europa.eu
MSCA opens €399 million call for Postdoctoral Fellowships
Postdoctoral Fellowships offer researchers holding a PhD the opportunity to acquire new skills through advanced training and international, interdisciplinary, and inter-sectoral mobility.
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Open Force Field @openforcefield.org · 17/03/2026
Ever wanted to simulate a modified peptide, such as, I don't know, maybe semaglutide? In this video, hosted by @sbgrid.bsky.social , Josh Mitchell will teach you how to do just that using our experimental peptide force field! The tutorial takes you from 0 to GLP-1 in an hour. youtu.be/4tyxCzrBreQ
youtu.be
Open Force Field
YouTube video by SBGrid Consortium
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Open Force Field @openforcefield.org · 09/03/2026
@sbgrid.bsky.social is hosting our own Josh Mitchell for their software seminar series tomorrow. Josh will introduce OpenFF's capabilities at modelling proteins and peptides with post-translational modifications. Register now! sbgrid.org/webinars/
sbgrid.org
Webinars
The SBGrid Consortium is an innovative global research computing group operated out of Harvard Medical School. SBGrid provides the global structural biology community with support for research computi...
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Open Force Field @openforcefield.org · 03/03/2026
The first session of the virtual workshop "Fitting a SMIRNOFF force field with PyTorch" is coming up on March 4th! docs.openforcefield.org/en/latest/wo...
docs.openforcefield.org
2026 OpenFF Workshops — OpenFF Ecosystem documentation
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Open Force Field @openforcefield.org · 18/02/2026
Please register for the workshops you’re interested in attending. Registration for the March 10th workshop is with @sbgrid.bsky.social. Hope to see you there! docs.google.com/forms/d/e/1F...
docs.google.com
Open Force Field Workshop Signups 2026
OpenFF will present 2 online workshops in each of March and April 2026: A: Simulating Post-Translationally Modified Proteins with OpenFF Rosemary B: Fitting a SMIRNOFF Force Field with PyTorch Each ...
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Open Force Field @openforcefield.org · 18/02/2026
Each workshop will be run twice to cover working hours in major time zones. Recordings and materials will also be available afterwards.
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Open Force Field @openforcefield.org · 18/02/2026
We are proud to present the "PTM" workshop with @sbgrid.bsky.social on March 10th as part of their webinar series.
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Open Force Field @openforcefield.org · 18/02/2026
We’re pleased to announce the 2026 OpenFF Virtual Workshops! Please join us in March and April for workshops on: - Simulating Post-Translationally Modified Proteins with the OpenFF Rosemary Alpha - Fitting a SMIRNOFF Force Field with PyTorch Details linked: docs.openforcefield.org/en/latest/wo...
docs.openforcefield.org
2026 OpenFF Workshops — OpenFF Ecosystem documentation
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Micaela Matta @micaelamatta.bsky.social · 06/02/2026
Not one but 2 (!) open #postdocjobs to work with me 1️⃣ tinyurl.com/EPSRCMattaPDRA 2-year postdoc on data-driven design and screening of organic mixed conducting materials ⚡️🔋 #omiecs Deadline: Feb 8 Ideal profile: MD or DFT skills, experience in #high-throughput workflows, strong coding skills
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Open Force Field @openforcefield.org · 03/02/2026
This playbook is part of a series covering all aspects of open source scientific software development. We hope other projects can learn from our experience!
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Open Force Field @openforcefield.org · 03/02/2026
#documentation makes the difference between a piece of code and a tool. @omsf.io is developing deep expertise in documenting #opensource scientific software, and now shares this expertise in a "playbook," including contributions from our own Josh Mitchell. playbooks.omsf.io/documentation/
playbooks.omsf.io
Documentation Playbook
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Open Force Field @openforcefield.org · 14/01/2026
More details on training and benchmarking Sage 2.3.0 are available in our preprint: bsky.app/profile/open...
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Open Force Field @openforcefield.org · 14/01/2026
And in Python: >>> from openff.toolkit import Molecule, ForceField >>> forcefield = ForceField("openff-2.3.0.offxml") >>> molecule = Molecule.from_smiles("CCO") >>> interchange = forcefield.create_interchange(molecule.to_topology())
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Open Force Field @openforcefield.org · 14/01/2026
The easiest way to try out Sage 2.3.0 is by creating a new environment with the latest OpenFF ForceFields: micromamba create -n openff -c conda-forge "openff-toolkit>=0.17" "openff-forcefields==2026.01.0" micromamba activate openff
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Open Force Field @openforcefield.org · 14/01/2026
Sage 2.3.0 maintains or improves performance on all of our benchmarks except solvation free energies in nonaqueous solvents. Please try it out and let us know if you find any substantial improvements, regressions, or other issues in comparison to Sage 2.2.1!
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Open Force Field @openforcefield.org · 14/01/2026
We’re pleased to announce the full release of the Sage 2.3.0 force field! This is identical to the previous release candidate Sage 2.3.0rc2. Sage 2.3.0 is the first OpenFF force field to use the AshGC neural network charge model. github.com/openforcefie... #compchem
github.com
Release Sage 2.3.0 · openforcefield/openff-forcefields
This release adds openff-2.3.0.offxml and openff_unconstrained-2.3.0.offxml. Sage 2.3.0 is the first OpenFF force field to use the AshGC neural network charge model to assign charges. Both vdW para...
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Open Force Field @openforcefield.org · 06/01/2026
AshGC is used in our latest force field, Sage 2.3.0
Overview of the AshGC charge model. A molecule is first checked against a look-up table comprised of molecules with three or fewer heavy atoms. If found, the partial charges in that look-up table are returned. If not found, the molecule is converted into a featurized graph and passed through the neural network model. In the first stage, a graph convolutional neural network generates atom embeddings, which are then pooled and passed to a multi-layer perceptron (MLP) to predict an initial charge, electronegativity, and hardness value for each atom. From these, the final partial charges are computed as the analytical
minimum of the electrostatic energy.
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Open Force Field @openforcefield.org · 06/01/2026
New preprint describing our GNN charge model, AshGC! Since QM methods of charge assignment scale poorly to larger molecules, and are also conformation dependent, AshGC leads to major performance improvements in this critical step in force field parameterization. chemrxiv.org/engage/chemr...
chemrxiv.org
Developing and benchmarking Sage 2.3.0 with the AshGC neural network charge model
We report a new charge model and a new general small molecule force field. Here, we address the development and benchmarking of both the Open Force Field (OpenFF) AshGC charge model, as well as the Sa...
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Open Force Field @openforcefield.org · 18/12/2025
These results are also a benchmark of our force field, Sage 2.2.0!
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Open Force Field @openforcefield.org · 16/12/2025
Thomas Steinbrecher joins as an elected representative of the industry partners who fund our efforts and provide advice and direction. He has been an active and influential voice in this community, and we appreciate his commitment to the success of the project.
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Open Force Field @openforcefield.org · 16/12/2025
Danny Cole joins as an additional PI, in recognition of the central role his independent research has been playing in advancing the science and infrastructure of Open Force Field.
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Open Force Field @openforcefield.org · 16/12/2025
Our seven-member Governing Board includes two elected representatives from supporting Partners and five Principal Investigators. The Governing Board makes strategic operational decisions and oversees expenditures.
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Open Force Field @openforcefield.org · 16/12/2025
The Open Force Field Consortium is a pre-competitive, industry-funded effort to build more accurate force fields and to improve predictive power of computational drug discovery techniques.
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Open Force Field @openforcefield.org · 16/12/2025
The Open Force Field Consortium welcomes two new members to our Governing Board: Daniel Cole (of @colegroupncl.bsky.social ) and Thomas Steinbrecher (of Roche)!
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Open Force Field @openforcefield.org · 25/11/2025
Installation instructions and usage examples are available in the repository README at github.com/openforcefie...
github.com
GitHub - openforcefield/ptm_prototype
Contribute to openforcefield/ptm_prototype development by creating an account on GitHub.
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Open Force Field @openforcefield.org · 25/11/2025
Pablo v0.2.0 includes expanded custom residue definition capabilities, including the ability to define "anonymous" residues that don't rely on atom names. The workflow demonstrates parameterizing a post-translationally modified protein system and running a short OpenMM simulation.
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Open Force Field @openforcefield.org · 25/11/2025
The updated workflow uses a new tool (openff-pablo v0.2.0) for loading modified proteins from PDB files and the new prototype Rosemary force field (OpenFF 3.0.0 alpha 0) for a self-consistent treatment of both canonical and noncanonical protein residues.
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Open Force Field @openforcefield.org · 25/11/2025
The scientific work is still ongoing, but we’re releasing a prototype version so you can try it out now and learn how it will fit into your workflow once it’s fully ready for production.
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Open Force Field @openforcefield.org · 25/11/2025
Years of research on modeling proteins are beginning to pay off in a new force field that can do something no other publicly available force field can do: accurately model proteins, peptides, and general organic molecules with one consistent set of parameters.
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Open Force Field @openforcefield.org · 25/11/2025
To showcase the unique capabilities of our upcoming force field, OpenFF 3.0 “Rosemary,” we've released an improved version of our PTM prototype workflow for parameterizing a protein with post-translational modifications. github.com/openforcefie...
github.com
GitHub - openforcefield/ptm_prototype
Contribute to openforcefield/ptm_prototype development by creating an account on GitHub.
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Open Force Field @openforcefield.org · 17/11/2025
Jeff Wagner and Jen Clark ran a workshop at the @mdanalysis.bsky.social UGM in Arizona last week, in coordination with the @openfree.energy team.
Left to right: Mike Henry, Alyssa Travitz, Irfan Alibay, Jennifer Clark, Jeffrey Wagner, Hugo McDermott-Opeskin
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Cole Group @colegroupncl.bsky.social · 13/11/2025
If you're at #ukqsar today, be sure to check out posters by @finlayclark.bsky.social, on work with @openforcefield.org, and @asmaferiel.bsky.social & @chikitng.bsky.social on computer-aided drug design methods! #compchem
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Micaela Matta @micaelamatta.bsky.social · 29/10/2025
Glad to see this in print! Check out @hannahturney.bsky.social’s Perspective on atomistic polymer modeling out on @pubs.acs.org #ACSEditorsChoice pubs.acs.org/doi/10.1021/...
pubs.acs.org
Atomistic Polymer Modeling: Recent Advances and Challenges in Building and Parametrization Workflows
Synthetic polymers are a broad and versatile class of soft materials covering a large chemical space. “Computational microscopy” approaches such as atomistic molecular dynamics (MD) simulations are an effective tool to validate and rationalize experimental data for structure–property characterization. The predictive quality of MD simulations and the properties derived from them are primarily driven by the accuracy and relevance of the force field used to represent the system. While biomolecular simulation (nucleic acids, proteins) workflows benefit from dedicated toolkits and domain-specific force fields, the modeling of synthetic polymers has not progressed to the same extent. This perspective will discuss recent efforts to improve system building and parametrization workflows for synthetic polymers, and the unique challenges differentiating them from biopolymers. We will outline shortcomings in established workflows, review best practices for FAIR polymer simulations, and highlight new tools/workflows leveraging cheminformatics, direct chemical perception, and neural networks.
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Open Force Field @openforcefield.org · 28/10/2025
Chapin Cavendar's paper, Structure-Based Experimental Datasets for Benchmarking Protein Simulation Force Fields, is out now in LiveCoMS. Read it for a detailed look at the great work he has been doing toward an OpenFF protein force field, and stay tuned! livecomsjournal.org/index.php/li...
livecomsjournal.org
Structure-Based Experimental Datasets for Benchmarking Protein Simulation Force Fields [Article v1.0] | Living Journal of Computational Molecular Science
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Cole Group @colegroupncl.bsky.social · 15/10/2025
It's ligand-focussed day at the #CCPBioSim training week, and we've been using @openforcefield.org & @openmm.org to parameterise and run protein-ligand MD, and @mdanalysis.bsky.social & ProLIF for analysis! #compchem
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Open Force Field @openforcefield.org · 10/10/2025
Compared to Sage 2.2.1, Sage 2.3.0-rc2 splits torsions so that a single torsional parameter only covers a central bond with a single multiplicity. It also adds some bond and angle types to improve performance of targeted chemistries, such as small rings.
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Open Force Field @openforcefield.org · 10/10/2025
Sage 2.3.0-rc2 is applicable to drug-like molecules consisting of the elements C, H, O, N, P, S, F, Cl, Br, and I, atomic Xe, and the monoatomic ions Li+, Na+, K+, Rb+, Cs+, F-, Cl-, Br-, and I-.
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Open Force Field @openforcefield.org · 10/10/2025
Sage 2.3.0-rc2 is the second force field candidate in Open Force Field using AshGC v1.0. Both vdW and valence parameters have been re-fit, using AshGC charges, to a dataset of physical properties and QM data.
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Open Force Field @openforcefield.org · 10/10/2025
AshGC supports most small-molecule chemistries with elements C, O, H, N, S, F, Br, Cl, I, P; a list of excluded SMARTS patterns is included in the documentation. docs.openforcefield.org/projects/nag...
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