Simple UML Diagrams for PowerPoint
yUML is an online tool for creating and publishing simple UML diagrams. You can use yUML to make UML diagrams and then copy and paste to your MS PowerPoint slides. This way, software architects or developers can enjoy a simple tool for software development, analysis and design using common tools and popular like PowerPoint.
The tool is free and very simple. You just need to Draw a diagram by specifying the UML language. Then you can choose the type of diagram boxes to use and this: boring, plain or scruffy. The last design is similar to the design used by other prototyping software like Pencil Project.
This is an example of UML diagram using the Scruffy design: http://yuml.me/diagram/scruffy/class/draw
You can draw Activity diagrams, Use Case Diagrams and Simple Class Diagrams using yUML. Once you design your diagram you can just copy the output image into PowerPoint or save it using the browser and then open the PPT in PowerPoint if you want to make a PowerPoint presentation or prepare a software development PowerPoint template.
Learn more in http://yuml.me/