NetBeans IDE UML Features

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The UML plugin for the NetBeans IDE is available for version 6.7 and earlier releases.

Visual Paradigm: SDE for NetBeans The SDE for NetBeans from Visual Paradigm provides a wide range of enterprise class features including: Importing existing NetBeans UML projects Team collaboration capabilities Code generation for Java, C++, PHP and more  Learn more at visual-paradigm.com.
JDeveloper Looking for a full featured, free UML modeling environment? JDeveloper provides comprehensive modeling capabilities that include UML diagrams like Use Case, Class, Activity and Sequence Diagrams Domain Specific Modelers like JSF Flow diagrams, EJB Diagrams, Database Modeler and Schema Editor.  Learn more at oracle.com.