simple, text driven UML drawing tool

 UMLet is a UML tool aimed at providing a fast way of drawing
 UML diagrams. UML elements are modified using text input instead
 of pop-up dialogs. Elements can be modified and used as
 templates; this way, users can easily tailor UMLet to their
 modeling needs. UMLet supports a variety of UML diagram types:
 class diagrams, use case diagrams, sequence diagrams, state
 diagrams, deployment diagrams, activity diagrams, etc.
 .
 UMLet can only be used for drawing UML diagrams, it does not
 support code export or the XMI format. UMLet allows one to export
 diagrams as images or PDF.