Its written in PL/SQL, tests PL/SQL packages, functions and procedures and is driven by a set of database tables to hold the configuration and the results. The idea is that you can target a particular package or a complete schema.
Blog entry with a discussion here:
http://www.petefinnigan.com/weblog/arch ... 001227.htm
And the actual code is available here:
http://www.slaviks-blog.com/wp-content/ ... fuzzor.sql