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

Feature List:
+the latest UML support (class diagram, use case diagram, object diagram, package diagram, sequence diagram, collaboration diagram, state diagram, activity diagram, component diagram, deployment diagram)
+OOAD support - object-oriented analysis (OOA), object-oriented design (OOD)
+Textual analysis for identifying candidate actors, use cases, classes...
+CRC (Class-Responsibility-Collaborator) Card diagram
+Use case modeling (use case description...)
+Business Workflow diagram - Process, Decision, Business Actor, Document
+Incremental round-trip engineering
+Code Generation - model to code, diagram to code (UML model to code, class diagram to Java)
+Reverse engineering - code to model, code to diagram (Java to UML models, Java to class diagram)
+Instant Reverse for Java, C++, XML, DotNET exe/dll, CORBA IDL
+Auto-synchronization between source code and diagrams
+Report generator for generating documentation
+Automatic diagram layout - rearrange shapes and connectors
+Import XMI/export XMI
+Import Rational Rose
+Microsoft Visio Integration - UML diagramming with stencils from MS Visio
+Export diagrams to images (PNG, JPG, SVG)
+Plugin and template
+Version control
+Multilingual support
+More...

Other UML modelling Tools / UML Plugins:
Windows Platform:
+SDE for MS Visual Studio .NET
Java Platform (Windows/Linux/Mac OS X):
+SDE for Oracle JDeveloper
+SDE for IBM WebSphere
+SDE for JBuilder
+SDE for IntelliJ IDEA
+SDE for Eclipse
+SDE for NetBeans
+SDE for Sun ONE
+More SDE...