iAPBS is a C/C++/Fortran interface to APBS, fast and powerful Poisson-Boltzmann equation solver. This interface enables access to most of APBS capability from within any C/C++ or Fortran code. In addition to the reference implementation, iAPBS/CHARMM, iAPBS/NAMD and iAPBS/Amber modules are also available. These modules extend CHARMM, NAMD and Amber functionality with APBS routines for electrostatic calculations.
Please acknowledge the use of NBCR software: "This project was supported by grants from the National Center for Research Resources (5P41RR008605-19) and the National Institute of General Medical Sciences (8 P41 GM103426-19) from the National Institutes of Health"