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This is an early preview release of the openforcefield toolkit that matches the functionality described in the preprint describing the SMIRNOFF v0.1 force field format: [DOI]
This release features additional documentation, code comments, and support for automated testing.
A significant (though currently unused) problem in handling of improper torsions was corrected.
Previously, non-planar impropers did not behave correctly, as six-fold impropers have two potential chiralities.
To remedy this, SMIRNOFF impropers are now implemented as three-fold impropers with consistent chirality.
However, current force fields in the SMIRNOFF format had no non-planar impropers, so this change is mainly aimed at future work.