The core of the software is a modular set of callable routines which allow manipulating coordinates and evaluating potential energy and derivatives via straightforward means.

The source code is available free of charge to non-commercial users under a proprietary license.

The code is written in portable FORTRAN 77, Fortran 95 or CUDA with common extensions, and some C. Core developers are: (a) the Jay Ponder lab, at the Department of Chemistry, Washington University in St. Louis, St. Louis, Missouri.

Laboratory head Ponder is Full Professor of Chemistry, and of Biochemistry & Molecular Biophysics; (b) the Pengyu Ren lab , at the Department of Biomedical Engineering University of Texas in Austin, Austin, Texas.

Laboratory head Ren is Full Professor of Biomedical Engineering; (c) Jean-Philip Piquemal's research team at Laboratoire de Chimie Théorique, Department of Chemistry, Sorbonne University, Paris, France.