Converting GIS data from GRASS to ArcInfo
- Grass2Arc and Grass2Grid for converting v4.x GRASS data files to ArcInfo. Unix based, 1996.
- http://deathstar.rutgers.edu/people/rowan/grass2arc.html

Rocky Mountain Mapping Center Software Library
- A variety pack including DEM and DOQ conversion, hillshades, mosaicking, clipping, plotting, scalebars, and UTM Zone determination.
- http://rmmcweb.cr.usgs.gov/software/

Dave and Harvey's Slope Stability Package
- This tool collection calculates slope stability for a Digital Elevation Model.
- http://duff.geology.washington.edu/mdbrg/mdbrg/mdbrg/stability/

Eykamp's GIS Tools
- Explanations of scalebars, embedding perl code, passing parameters, and distributed backups.
- http://www.eykamp.com/gistools/index.htm