Software design & UML diagrams
UML shapes are available only for paid Gliffy accounts. To use UML shapes, upgrade your account to a paid one (see Changing your plan).
Gliffy makes it easy to visualize your software project with UML diagrams. For more information about different types of UML diagrams, along with great examples, see https://www.gliffy.com/examples/uml-diagrams.
To help you create them, when you create a new diagram, you can choose from several Software Design & UML templates.
And, several Software Design shape libraries offer typical UML shapes.