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draw.io - Online diagramming application
Subclipse - Subclipse is a Suvbersion support in the Eclipse IDE.
Dia - Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.
Optimizer for Eclipse - Optimizer for Eclipse is a free plugin that finds and fixes common configuration issues.
yEd - yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.
UMLet - UMLet - Free UML Tool for Fast UML Diagrams