StarUML is an open source project to develop fast, flexible, extensible, featureful, and freely-available UML/MDA platform running on Win32 platform. The goal of the StarUML project is to build a software modeling tool and also platform that is a compelling replacement of commercial UML tools such as Rational Rose, Together and so on.

AndroMDA (pronounced: andromeda) is an open source code generation framework that follows the model driven architecture (MDA) paradigm. It takes a UML model from a CASE-tool and generates classes and deployable components (J2EE or other), specific for your application architecture.