GROMACS

ESPResSo, the Extensible Simulation Package for Research on Soft Matter, is a highly versatile open source simulation package for performing and analyzing scientific molecular dynamics and Monte Carlo many-particle simulations. It is designed as a universal tool for simulating a variety of soft matter systems, especially coarse-grained atomistic or bead-spring models used in physics, chemistry, molecular biology, and process engineering. ESPResSo can be used to simulate polymers, liquid crystals, colloids, polyelectrolytes, ferrofluids, gels, biological systems, DNA, lipid membranes, bacterial motion, and super-capacitors. In coarse-grained models, a group of atoms or molecules is treated as a single bead, allowing researchers to investigate larger time and length scales than would be practical with fully atomistic simulations. ESPResSo supports classical molecular dynamics simulations in different statistical ensembles.

MercuryDPM is an open source code for discrete particle simulations, designed to simulate the motion of particles or atoms by applying forces and torques from external body forces, such as gravity or magnetic fields, and from particle interaction laws. For granular particles, these forces are typically contact forces, including elastic, plastic, viscous, and frictional interactions, while molecular simulations can use interaction potentials such as Lennard-Jones. MercuryDPM is written as a versatile, object-oriented C++ code and is built to be understandable, flexible, and extensible for researchers and engineers who need to create new simulation models. It is developed extensively for granular applications, while remaining adaptable to other particle-based systems and long-range interactions. Its documentation guides users through installation, running simulations, visualization, analysis, and creating new MercuryDPM codes to model systems of their choice.