Visual Paradigm International Limited announced the release of Visual
Paradigm for UML 6.1 (VP-UML 6.1), an award winning UML CASE Tool.
Ruby has been added to the list of supported languages. This feature
is supported in VP-UML in Standard or higher editions.
Generate Ruby
http://resource.visual-paradigm.com/vpsuite3.1/instant_generate_ruby.html