StarUML - StarUML
Eclipse Papyrus - Eclipse Papyrus is an industrial-grade open source Model-Based Engineering tool. Eclipse Papyrus has notably been used successfuly in industrial projects and is the base platform for several industrial modeling tools.
draw.io - Online diagramming application
Topcoder - The Topcoder home page has received a slick new makeover that lets new customers quckly login, discover the power of our community, and launch challenges.
UMLGraph - UMLGraph is a professional automated drawing tool that allows the designers the declarative specification and drawing of UML class and sequence diagram.
ObjectAid - The ObjectAid UML Explorer is an agile and lightweight code visualization tool for the Eclipse IDE.