GROMACS is a versatile package to perform molecular dynamics, i.e. simulate the Newtonian equations of motion for systems with hundreds to millions of particles. It is primarily designed for biochemical molecules like proteins and lipids that have a lot of complicated bonded interactions, but since GROMACS is extremely fast at calculating the nonbonded interactions (that usually dominate simulations) many groups are also using it for research on non-biological systems, e.g. polymers.
The gmx-users and the gmx-developers mailinglists are very active and the main developers read and reply (as do many other members of the community). Before posting it may be a good idea to read How to ask questions the smart way.
Let everyone else know about the native community for you favourite Biomolecular Simulation package. Use one topic per package.
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