APBS is a software package for the numerical solution of the Poisson-Boltzmann equation, a popular continuum model for describing electrostatic interactions between molecular solutes over a wide range of length scales. <http://www.poissonboltzmann.org/>.
Please register at http://goo.gl/LGVU5j before downloading!
- molecular modeling
- implicit solvent models
- finite difference solver
- finite element solver
Really raised the bar!
nice and simple GUI, i like it a lot better.
And, it is free for us to use.
I have used this program for and it is great.