Unified Modeling Language ...

[[Could someone discuss what UML is useful for?  How about some examples that are relevant relating to the building of tcl based code?]]

[RS]: For Tcl not really, because UML is used in OO Analysis and Design, so results in generating C++/Java code with class definitions, attributes and methods. [Incr Tcl] maybe...

"[Playing UML]" gives routines for drawing movable UML graphs (use case and class diagrams so far, more maybe to come) on a canvas.

A variety of UML related tool pointers may be found at [Applications in Tcl and Tcl/Tk].

[Ideogramic] specializes in UML-targeted Gesture Recognition.

Also, see [Invoking Tcl commands from Cplusplus] for some info on the
Voodoo UML class diagram editor.