This video show how to draw UML Activity and Use Case Diagrams with Oryx. Oryx is an open soruce web-based editor for modeling business processes in various modeling languages like BPMN or EPC.
This short video shows how the UML activity diagram works in Visual Studio 2010.
This short tutorial presents the use cases and class diagrams.
Violet UML Editor is a free open source software written in Java used to create UML diagrams (use cases diagram, class diagrams, object diagram, state diagram, state,activity and sequence diagram).
This video shows how to use the Unified Modeling Language use cases diagram to brainstorm the scope and features of an application with Visual Studio 2010.
PlantUML is a open source component that allows to quickly write Unified Modeling Language (UML) diagrams defined using a simple and intuitive language.