Open Source / Non-Proprietary
a UML modeller written in C++/wxWidgets (licensed under the GNU GPL)
UML Pad is a CASE tool for UML diagrams design.
It supports Use Case, Class, Sequence, State and Activity diagrams.
It allows printing and exporting of the diagram image.
For Class diagrams it's also possible to export the documentation in html format.
The project has been realized with support of the wxWidgets class library.