This is a molfile plugin for the HOOMD-blue xml-based topology file format to be used with VMD and other codes that support VMD's molfile plugins. Due to the complications of parsing and writing compliant xml format files, the hoomdplugin relies on the expat library. This in turn makes it complicated to support it in the VMD cross-platform builds and thus it is currently only bundled with some precompiled VMD packages and then only as dynamical plugin. See the README file for details. The latest package contains plugin binaries for Linux (32-bit x86, 64-bit x86_64), MacOS X (32-bit x86, 64-bit x86_64) and Windows (32-bit only) that should work with VMD 1.8.7, VMD-1.9, and VMD-1.9.1. To install the binaries, just copy the hoomdplugin.so file into the directory of your VMD installation where all other molfile plugins reside (<vmdpath>/plugins/<arch>/molfile/). On Linux you may also need to copy the libexpat.so.0 library to the lib directory of your VMD installation; on Windows correspondingly the libexpat-1.dll file.