Hi Randy, http://www.minq.se/products/dbvis/info.html should answer your questions. If you download it and don't give it a license key it silently assumes it is the free version.
This covers part of the kernel - users and some of objects and cr. It was built with dia, which can output png or pdf. There are tools that autogenerate dia from sql schemas, but there's still a lot of manual work to make them pretty.