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Software
r.roughness - is a GRASS-GIS (versions 6.1 or above) shell script to calculate the surface roughness of a DEM, using r.surf.area and v.surf.rst. (uses sh as shell. Use r.roughness_bash, if you run bash).r.roughness60 - for GRASS-GIS versions 6.0.x
azimuth.c - is a small C program to calculate the azimuth and length of vector lines exported by GRASS-GIS as ASCII files. It is useful for create rose diagrams of lineament maps.
Improvements on the original code after suggestions by Örs Téglásy, Hungary.
See others GRASS AddOns