Dia is roughly inspired by the commercial Windows program 'Visio', though more geared towards informal diagrams for casual use. It can be used to draw many different kinds of diagrams.
The UML stencil for Microsoft Visio supports symbols of the UML 2.0, specified in OMG UML Superstructure Specification, formal/05-07-04, as well previous UML versions 1.5, 1.4, 1.3 and 1.1. The stencil also contains several non-normative UML symbols, tha