What do you think about SwissParam, MolMeccano, GAAMP?
http://gaamp.lcrc.anl.gov/
http://www.molmeccano.com
http://www.swissparam.ch
I can't tell exactly what you're trying to do, but if it's atomtyping systems that you're after, It would be worth giving foyer a shot. It was developed in Peter Cummings' lab and we've been using it for a few months now in some automated workflows. We don't have all OPLS atomtypes added but we're working on it and can add as needed by users. The backend relies on ParmEd so the input structures and generated topologies can easily be read/written to GROMACS, AMBER, etc.
Everything is open-source and installable with Anaconda.
https://github.com/mosdef-hub/foyer
If you choose to mess around with this and find any issues, please do let me know.
I'm not sure what "atomtyping systems" is. However, it does not seem that this is a force field generator, that is, force constants. I mean the quality of the force constants.
In that case we're talking about different things; applying the force field vs. making it. My mistake.
@Stéphane Abel
What force field from your viewpoint is the most accurate?
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