Open Source / Non-Proprietary
multi-platform UML 2.0 toolbox. Can generate C++/Java/IDL/PHP/Python and reverse engineer C++/Java/PHP. Very high performance (written in C++ with Qt). Licensed under the GNU GPL.
UML2 Tools is a set of GMF-based editors for viewing and editing UML models. UML2Tools is a part of Galileo Project. UML2Tool is in incubation phase now. UML2 Tools provides diagram editors for
Sequence (expected in Galileo M3)