The IRvine Astrophysical simulaTion structurE format is a HDF5-based format for cosmological n-body and hydrodynamical simulations. This package includes tools for loading and transforming IRATE data.
Documentation for the IRATE library and format is currently available from the downloads section of this bitbucket site. Alternatively, if you have sphinx installed, just do
python setup.py build_sphinx from the IRATE source code directory, and the documentation will be build in docs/_build/html.