1)   UModel 2008
Altova UModel 2008 Enterprise Edition is the starting point for successful software development. Visually design application models and generate code or reverse engineer programs into UML 2 diagrams. It's the simple cost-effective way to draw on UML.
UML, unified modeling language, application models, OMG, model driven architecture, data modeling, UML 2.1, software design, use case diagram, class diagram,

 2)   Altova UModel Professional Edition 2008
Altova UModel 2008 Professional Edition is the simple cost-effective way to draw on UML. Visually design application models and generate code or reverse engineer programs into UML diagrams. It's the starting point for successful software development.
UML, unified modeling language, application models, OMG, model driven architecture, data modeling, UML 2.1, software design, use case diagram, class diagram,

 3)   ClassDraw 1.01
Lets you create UML Class Diagrams and handles the layout automatically. As you enter basic details via dialog boxes, ClassDraw draws your diagram instantaneously based on built-in layout rules. No manual positioning of diagram elements is required.
class diagram, uml, unified modeling language, software development, software design,

 4)   yalips 3.0.1
yalips integrates several visualization techniques e.g. brainstorming, mapping, gantt (project management), flowcharts, and UML modeling. It can be learned within minutes from video tutorials and comes at moderate costs.
Brainstorming, Project Management, Flowchart, UML, Unified Modeling Language, Mapping, Visualization, Presentation, Learning, Planning,