Introduction ============ Protons is a python module that implements a constant-pH molecular dynamics scheme for sampling protonation states and tautomers of amino acids and small molecules in OpenMM. The codebase is currently under development by the `Chodera lab`_ at Memorial Sloan Kettering Cancer center. There is no official release of the code yet. If you are interested in the development of this code, you can watch the `repository on Github`_. For the planned features of the code, see :ref:`roadmap`. .. _Chodera lab: http://www.choderalab.org .. _repository on Github: https://github.com/choderalab/openmm-constph