Awesome

ColdFrame

ColdFrame is an open-source code generator backend for use with UML tools.

In its present state, it's targeted at ArgoUML¹ and generates Ada code frameworks.

The intermediate representation uses XML.

The code generation uses the XSL Transformation (XSLT) language, so - with an investment in time and thought - you can design your own transformation mechanisms to the programming language of your choice.

See here for more information.

There are examples.

1: ArgoUML version 0.35.1 is recommended. Note, this won't run on recent releases of macOS, because it relies on Java 6.