H5MD is a file format specification, based upon HDF5, aimed at the efficient and portable storage of molecular data (e.g. simulation trajectories, molecular structures, …). H5MD implements data models for a variety of computational problems, e.g., molecular simulation using molecular dynamics, or computational fluid dynamics using multi-particle collision dynamics.
The first official release of the specification will contain particle trajectories (positions, velocities, forces and species) as well as thermodynamical observables. Afterwards, extensions will be considered on the basis of discussion with users of H5MD.
The development of H5MD was started by Pierre de Buyl, Peter Colberg and Felix Höfling. H5MD now includes contributions by other developers. H5MD is available under the GNU General Public License version 3, or any later version. H5MD is presented in P. de Buyl, P. Colberg and F. Höfling, H5MD: A structured, efficient, and portable file format for molecular data, Comp. Phys. Comm. (2014) - [arXiv:1308.6382].
The H5MD format specification is maintained in a git repository:
git clone http://git.savannah.gnu.org/r/h5md.git
The latest revision is also available in PDF.