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Violet is a UML editor with these benefits: Very easy to learn and use. Draws nice-looking diagrams. Completely free. Cross-platform. Violet is intended for developers, students, teachers, and authors who need to produce simple UML diagrams quickly.
Want to contribute ? Source code is hosted on github : https://github.com/violetumleditor/violetumleditor
JAGAL provides implementations for directed graphs (weighted and unweighted) and varoius types of transition systems as well as utils for graph traversal and modification.
JAGAL builds upon the Java library TOVAL (located at http://sourceforge.net/p/toval). To use JAGAL, make sure the TOVAL library is on the build path.
This library uses and encloses jGraphX (https://github.com/jgraph/jgraphx).
A documentation for JAGAL can be found under http://doku.telematik.uni-freiburg.de/jagal.
Fast UML is an open-source UML tool with a simple user interface pop-up free. Draw UML diagrams fast, export diagrams to png, jpg and clipboard.
It pretends to be the union between Violet and UMLet.