GEMMI can help if you work with:
- macromolecular models (from mmCIF, PDB and mmJSON files),
- refinement restraints (CIF files) and small molecule models,
- crystallographic reflections (from MTZ and SF-mmCIF files),
- electron and other density maps (MRC/CCP4 files),
- crystallographic symmetries,
- or if you just read and write CIF/STAR files (where C=Crystallographic).
GEMMI is a C++ library (currently, C++14) accompanied by:
- command-line tools,
- Python bindings,
- Fortran 2003+ interface (in progress),
- partial WebAssembly bindings,
- online tools molecular viewer GemmiMOL and little data viz projects.
Documentation: http://gemmi.readthedocs.io/en/latest/
GEMMI is an open-source project of CCP4 and Global Phasing Ltd, two major providers of software for macromolecular crystallography.
Citing: JOSS paper.
License: MPLv2, or (at your option) LGPLv3. © 2017-2025 Global Phasing Ltd.