ソースコードの重複を検出する Simian
http://www.redhillconsulting.com.au/products/simian/
http://mag.autumn.org/Content.modf?id=20060104171032
Simian (Similarity Analyser) identifies duplication in Java, C#, C, C++, COBOL, Ruby, JSP, ASP, HTML, XML, Visual Basic source code and even plain text files. In fact, simian can be used on any human readable files such as ini files, deployment descriptors, you name it.