Umlet: http://www.umlet.com/ http://www.umlet.com/ Super easy to learn, efficient to use, runs anywhere, can reverse engineer Java code, free and open sourc

Umlet: http://www.umlet.com/ http://www.umlet.com/ Super easy to learn, efficient to use, runs anywhere, can reverse engineer Java code, free and open source. It also comes with a palette so you can draw UML diagrams without knowing much UML.