The current version doesn't accept problems that have continuously valued attributes. Check this page once in a while to see if a version that accepts them comes out. All the files available here are gzipped tar files. Your browser will probably uncompress them, but you will have to untar them. The manual for smog.
Data sets Two small examples in Espresso format.
Two small examples in C4.5 format. Data sets used for the comparisons made using smog. Get the file, untar it and type make at the top level after changing the first line in the top level Makefile. This program is still in an experimental stage and I cannot consider a full release of the source code at this point. The source code is here but is not open to persons outside the CAD group.