netcdf -- network Common Data Form
http://www.unidata.ucar.edu/packages/netcdf/
NetCDF (network Common Data Form) is an interface for array-oriented data
access and a library that provides an implementation of the interface. The
netCDF library also defines a machine-independent format for representing
scientific data. Together, the interface, library, and format support the
creation, access, and sharing of scientific data. The netCDF software
was developed at the Unidata Program Center in Boulder, Colorado. The
freely available source can be obtained as a compressed tar file or a
zip file from Unidata or from other mirror sites. Please note that the
Fortran90 interface is missing from this build, as I don't have access
to a F90 compiler.