This seems like it is primarily an academic/learning project but I think it could be a good way of learning UML. I especially liked this part of the philosophy

This seems like it is primarily an academic/learning project but I think it could be a good way of learning UML. I especially liked this part of the philosophy - "P2. An Umple programmer should never need to edit generated code to accomplish any task. The need for round-tripping (editing generated code and then reflecting the edits back into the model) common in the Model Driven Engineering world is not needed."