UML Resources

http://www.greenbirdsoftware.com/

http://en.wikipedia.org/wiki/List_of_Unified_Modeling_Language_tools

http://publib.boulder.ibm.com/infocenter/rtnlhelp/v6r0m0/index.jsp?topic=/com.ibm.xtools.modeler.doc/topics/cgeneral.html

http://publib.boulder.ibm.com/infocenter/rsmhelp/v7r0m0/index.jsp?topic=/com.ibm.xtools.modeler.doc/topics/cgeneral.html

http://www.gentleware.com/uml-software-community-edition.html

http://www.gentleware.com/