OpenAmeos is the multi-platform/multi-user UML® Modeling Environment with unique support for UML 2.0 Profiles, MDA® based Model Transformation and support for color to visualize semantics.

OpenAmeos supports all UML1.x diagram types and is presently in the process of moving towards UML2. MDA based code generation templates are available for Java, C++, C, Ada95, C#. Additional templates and profiles support platforms such as RavenScar or the Java High-Integrity-Platform (HIP).

OpenAmeos is the open source version of the Ameos UML modeling tool. In early 2007, Aonix decided to release the Ameos source code to the public. Under the terms of the Ameos open source agreement , a "clean" open source version of Ameos, called OpenAmeos, has been created to ensure that anyone installing a new version of OpenAmeos will be able to use it freely without encumbrances of any other source contributions.

Any company or academic institution who wants to distribute OpenAmeos, is required to also make their changes to the source code freely available to others in order to ensure the continuing open evolution of OpenAmeos.