Main sources

netcdf

http://www.unidata.ucar.edu/software/netcdf/

cf convention

http://cf-pcmdi.llnl.gov/

units

http://www.unidata.ucar.edu/software/udunits/udunits-1/index.html

Programming

General programming tutorial

http://www.unidata.ucar.edu/software/netcdf/docs/netcdf-tutorial.html

Matlab

http://mexcdf.sourceforge.net/ (in matlab by default in versions >= 2008b)

Fortran 90

http://www.unidata.ucar.edu/software/netcdf/docs/netcdf-f90/

Fortran 77

http://www.unidata.ucar.edu/software/netcdf/docs/netcdf-f77/

Java

http://www.unidata.ucar.edu/software/netcdf-java/

Python

http://www.pytables.org/moin/PyTables and http://www.scipy.org

Utilities

nco

http://nco.sourceforge.net/

gdal

http://www.gdal.org/

fwtools

http://fwtools.maptools.org/ (OpenEV, GDAL, MapServer, PROJ.4 and OGDI)

spatial ref

http://spatialreference.org/

NetCDF current discussions

From netcdf news group comp.lib.netcdf