An open source command line utility for converting maps in Doom WAD files to images. There are many options to control how the images are created. wad2image can select multiple maps from multiple WAD files and create images for those maps. wad2image can create animated GIFs to illustrate the differences between revisions of a map.
Check out wad2image's home page at http://selliott.org/utilities/wad2image for more info.
See the "doc" directory for credit, development, license and version information.