Dia 0.96.1
Dia is an open source program designed for drawing diagrams, much like Microsoft Visio. However, it is a poor alternative to Visio, with an overly simplistic user interface and many of the problems that plague GIMP from becoming a viable substitute for Photoshop.
Don't worry, Dia is mature code and runs fast, though while fully functional, the lack of template drag and drop diagramming images makes design a bit of a hassle. It has a decent set of premade images, with support for UML diagrams, database design, etc. but not quite at the level of Visio.
Not recommended yet, but take a look. Hopefully the development team can continue to add features to make it competitive with Visio.
Official Site:
http://live.gnome.org/Dia
