Visual Paradigm for UML is a professional UML tool that supports complete software lifecycle - object-oriented analysis, object-oriented design, construction, testing and deployment. The UML modeling software helps you build quality applications faster, better and at lower cost. You can draw all types of class diagrams, reverse code, generate code from diagrams and generate documentation. The UML CASE tool also provides abundant UML tutorials, UML interactive demonstrations and UML projects.

Feature List:
+Support UML 2.1
+Business Process diagram
+Mind Mapping
+Requirement Modeling with automatic generate requirement ID (Enhanced)
+Event-driven Process Chain
+Organization Chart
+Navigate between operation and sequence diagram (New)
+Better annotation for sequence diagram (New)
+Callout and Freehand shape
+Nicknamer - create translated copies of model
+Model Transitor
+User Interface Designer
+Java Roundtrip engineering
+Reverse engineering Java, C++, XML, .NET exe/dll, CORBA IDL, Python
+Code Generation - model/diagram to code
+Use Case Details Editor - All-in-one environment for specifying a use case's details including model specification and use case descriptions
+EJB diagram and code generation
+DFD
+ORM support - generate Java objects from database
+Database generation and reverse engineering
+Modeling collaboratively with VP Teamwork Server, CVS, Subversion and Perforce
+Relocate branch with drag and drop (New)
+Report generator
+Automatic diagram layout and reroute connector
+Import/export XMI file
+Support Stored Procedure and Trigger
+Export diagrams to JPG, PNG, SVG, EMF, PDF
+Access code for Floating License (New)
+More...

Other UML modeling Tools/UML Plugins:
Java Platform (Windows/Linux/Mac OS X):
+SDE for Eclipse
+SDE for NetBeans
+SDE for Sun ONE
+SDE for Oracle JDeveloper
+SDE for JBuilder
+SDE for IntelliJ IDEA
+SDE for WebLogic Workshop

Windows Platform:
+SDE for Microsoft Visual Studio
+More SDE...