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

Feature List:
+Supporting the latest UML notation
+CRC (Class-Responsibility-Collaborator) Card support
+OOAD support - object-oriented analysis (OOA), object-oriented design (OOD)
+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 - generate Java objects from database
+Database generation - ERD to database tables
+Database reverse - reverse database to ERD
+Round-trip engineering
+Code Generation - diagram to code, model to code
+Reverse engineering - code to diagram, code to model
+Instant Reverse for Java, C++, Dot NET dll/exe, XML, CORBA IDL...
+Auto synchronization between diagrams and source code
+PDF/HTML Report generator
+Automatic diagram layout - rearrange shapes and connectors
+Export/Import XMI
+Import Rational Rose mdl
+Visio Integration - diagramming with MS Visio stencils
+Export diagrams as images
+Team collaboration
+More...

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

Java Platform (Linux/Mac OS X/Windows):
+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...