openbabel-ruby

https://github.com/CamAnNguyen/openbabel-gem

Ruby bindings for OpenBabel, an open-source chemical toolbox for molecular modeling, cheminformatics, and computational chemistry. Supports 110+ molecular file formats (SMILES, SDF, MOL2, PDB, CIF, etc.), molecular fingerprints, 2D/3D coordinate generation, and structure manipulation. The gem compiles OpenBabel 3.1.1 from source with SWIG bindings during installation.