Panoply is a cross-platform application that runs on Macintosh, Windows, Linux and other desktop computers and allows users to plot geo-referenced and other arrayed data that are in netCDF, HDF, GRIB, and other data formats.
This video and step-by-step instructions focus on using Panoply with .netCDF files of NASA Aquarius(sea surface salinity) data accessed through THREDDS.