GNUPlot is a command-line program that can generate two- and three-dimensional plots of functions, data, and data fits.
clas-web
GEOrient
GEOrient plots and analyses stereographic projections and rose diagrams of geological structural data. Sources can be copied and pasted from other applications or read from text files. Wind rose options include plotting mean wind data (wind speed/wind frequency/wind energy).
Fragstats
Comparable:
FRAGSTATS is a computer software program designed to compute a wide variety of landscape metrics for categorical map patterns. It interfaces with ArcGIS and supports and a variety of sampling methods for analyzing sub-landscapes. It accepts raster images in a variety of formats, including ASCII grid, 8-, 16- and 32-bit integer grids, ESRI grid (or raster), GeoTIFF grid, VTP binary terrain format grid, ESRI header labelled grid, ERDAS Imagine grid, PCRaster grid, and SAGA GIS binary format grid. Support for the latter six image formats is via the GDAL library.
Here is the FragStats official website.