Visual Paradigm for UML (VP-UML) is a superior but user-friendly UML modeling tool that supports full software lifecycle - analysis, design, construction, testing and deployment. The UML CASE tool helps you build quality applications faster, better and cheaper. You can draw all types of UML diagrams, generate code from diagrams and vice versa, and generate documentation. The UML tool also provides plenty UML resources - UML tutorials, demos and projects.

Feature List:
+The latest UML support
+OO analysis (OOA), OO design (OOD) support
+CRC (Class-Responsibility-Collaborator) Card for finding objects
+Business Workflow diagram
+Incremental round-trip engineering
+Use Case Details Editor - An all-in-one environment for specifying a use case's details including general model specification and use case descriptions
+Full Screen Diagram Editing - Maximizes the diagramming area
+Sweeper - Drag to sweep shapes aside to make room for creating new shapes.
+EJB Diagram - Visualize EJB systems.
+EJB Code Generation and Deployment - Generate beans for your application development and deployment.
+ORM support - store Java objects into RDBMS
+Database generation - ERD to database tables
+Database reverse - existing DBMS to ERD
+Code Generation - model to code, diagram to code
+Reverse engineering - code to model, code to diagram
+Instant Reverse for XML, Java, Dot NET dll/exe, C++, Ada9x...
+Auto-sync between code and diagrams
+HTML/PDF Report generator
+Automatic diagram layout - rearrange shapes and connectors in diagrams
+Import XMI/export XMI
+Import Rational Rose project
+Visio Integration - drawing UML diagrams with Visio shapes
+Export diagrams to SVG, PNG, JPG
+Teamwork support
+More...

Other UML CASE Tools / UML Plugins:
Windows Platform:
+SDE for Microsoft Visual Studio .NET

Java Platform (Windows/Linux/Mac OS X):
+SDE for Oracle JDeveloper
+SDE for IBM WebSphere (WSAD)
+SDE for Borland JBuilder
+SDE for IntelliJ IDEA
+SDE for Eclipse
+SDE for NetBeans
+SDE for Sun ONE
+SDE for WebLogic Workshop
+More SDE...