Free demo copy is an on-line text book in itself. Must be something free in there. Free basic GIS for Windows. Navigate through the directory for free software of all kinds. Thanks to Bob Chiang for this link.
Data files are text.
Two self extracting files in the .zip file. Readme and .exe are in legal.zip. I've updated the expired version with a working copy. Written for production CAD work. Especially useful if you're not using a tablet.