A name like MiniFuzz File Fuzzer sounds like something you'd either read in a Dr Seuss book or on April 1st; however, Microsoft released this tool yesterday to provide "an easy to use, customizable solution for spotting unexpected application behavior."
Also released yesterday was the Microsoft BinScope Binary Analyzer. While this name isn't as fun as File Fuzzer, it still rates high on the geek scale for product names. In brief, the BinScope Binary Analyzer provides analysis of binary code to help you understand if your applications are vulnerable to common security coding errors.
You can download both tools freely from http://msdn.microsoft.com/en-us/security/cc421514.aspx along with a number of other Microsoft Security Development Lifecycle (SDL) tools.