This web page groups information about what is a UML Use Case Diagram (UCD) and when you should use it.
The UML Unified Modeling Language Planet is a portal aggregating feeds concerning UML and software modeling. http://www.umlplanet.com/
ArgoUML is an open source UML modeling tool that includes support for all standard UML 1.4 diagrams. It runs on any Java platform and is available in ten languages. Its design evaluation and checklists provides valuable help to make sure that your models are well formed. Beside the modeling aspects, …
The UML Unified Modeling Language Tools Directory presents a list of Unified Modeling Language (UML) tools that can be used to model Activity diagram, Class diagram, Communication diagram, Component diagram, Composite structure diagram, Deployment diagram, Interaction overview diagram, Object diagram, Package diagram, Sequence diagram, State diagram, Timing diagram, UML state …
The Model Factory wiki proposes a collection of models, patterns and articles, all presented from the viewpoint of a modeler. Its target audience is anyone who uses modeling to analyze a system. http://themodelfactory.org/
WebML provides graphical, yet formal, specifications, embodied in a complete design process, to express the structure of a Web application with a high-level description, which can be used for querying, evolution, and maintenance.
The UML® Resource Page of the Object Management Group is the main resource page for all information regarding the Unified Modeling Language (UML).