This page gives pointers to
(Note: these links will be enabled as WWW pages become available)
These are freely-available molecular dynamics codes, most of them parallel, which may be well-suited to the problems you want to model. They can also be used in conjunction with LAMMPS to perform complementary modeling tasks.
CHARMM, AMBER, GROMACS, NAMD, NWCHEM, and Tinker are designed primarily for modeling biological molecules. CHARMM and AMBER use atom-decomposition (replicated-data) strategies for parallelism (last time I checked); NAMD and NWCHEM and GROMACS use spatial-decomposition approaches, similar to LAMMPS. Tinker is a serial code.
DL_POLY includes potentials for a variety of biological and non-biological materials; both a replicated-data and spatial-decomposition version exist. HOOMD is a very fast MD code designed to run on GPUs, focused currently on non-biological materials (atomic systems, polymers).
The LAMMPS package itself includes only the simplest of visualization tools.
These are high-quality visualization packages we have used and can recommend. LAMMPS can either write output files directly in the input formats used by these programs, or contains auxiliary tools to convert to these formats:
Our group has also written and released a toolkit called Pizza.py which provides tools for doing LAMMPS pre- and post-processing, including simple OpenGL-based visualization. Pizza.py is written in Python, is available for download from this page. It includes Python wrappers that drive the Raster3d and RasMol packages listed above. It also includes tools that convert LAMMPS output into input files readable by VMD and AtomEye.
These are analysis and visualization packages we know less about, but which have features that may be attractive to LAMMPS users. More details are given below:
The company Scienomics has created an interface to LAMMPS as part of their Materials and Processes Simulations (MAPS) platform. It can be used to visualize and perform analysis on the output of LAMMPS simulations. They also have a tool called Amorphous Builder which can be used to create input geometries for LAMMPS. See the Scienomics WWW page for more details on both tools.
Guido Germano (Philipps-Universitaet Marburg) sent a link to his freely-available package QMGA which does OpenGL rendering of non-spherical (and spherical) objects. This could be useful for visualization of aspherical particles simulated with LAMMPS.
Erik Abrahamsson (U British Columbia) sent a link to his group's BioVEC visualization package. It allows for easy visualization of ellipsoidal particles. "The BioVEC program is written in C++, uses the OpenGL API for rendering, and is open source. It is lightweight, allows for user-defined settings for texture, and runs on either Windows or Linux platforms."
OVITO can import and export atomistic LAMMPS data/text dump/binary dump files and is available for free download from its WWW site.