Online UML diagramming tool (in Flash)

From the website

gModeler is a free online UML diagramming and documentation tool, targetted at developers working with ECMA 262 languages such as FlashMX's Actionscript, and Javascript. In addition to it's diagramming capabilities, it exports HTML documentation, FlashMX XML documentation (for the Action Panel and Reference Panel) and stub code (class code).

Old thing but amazing stuff. You can launch the tool directly by clicking here.