UML CASE tool - UML diagrams, use case modeling, reverse engineering and more...
Edit By BS Editor: 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, UML demonstrations and UML projects.

Feature List:
+the latest UML support (class diagram, use case diagram, sequence diagram, collaboration diagram, state diagram, activity diagram, component diagram, deployment diagram, object diagram, package diagram)
+OO analysis (OOA), OO design (OOD) support
+Textual analysis for identifying candidate classes, use cases, flow of events...
+CRC (Class-Responsibility-Collaborator) Card for finding objects
+Use case modeling (use case description, scheduling...)
+Business Workflow diagram
+Incremental round-trip engineering
+Code Generation - generate code, model to code, diagram to code (UML to code, UML model to Java)
+Reverse engineering - code to model, code to diagram (Java to UML models, Java to UML diagram)
+Instant Reverse for XML, Dot NET dll/exe, C++, CORBA IDL
+Auto-synchronization Between source code and diagrams
+Report generator for generating documentation
+Automatic diagram layout - rearrange classes and connectors in diagrams
+Import XMI/export XMI
+Import Rational Rose project
+Microsoft Visio Integration - drawing UML diagrams with Visio shapes
+Export diagrams to SVG, PNG, JPG
+Plugin and template
+Version control
+Multilingual 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
+More SDE... you can free download Visual Paradigm for UML (SE) for Java 3.1 now.