The content of an H5M file can be accessed by any HDF5 compatible tool.
The following viewers are available from the HDF Group:
HDFView : https://www.hdfgroup.org/downloads/hdfview/
HDF Compass : Deprecated; Use HDFView.
Please visit the general support page of the HDF Group for more information.
The following pages give some examples to further read and/or write with specific tools and languages:
Overview
Content Tools