A Finite State Machine Editor, written on QT.
It allows to draw Finite State Machine with easy GUI and store it in XML file.
There are Finite State Machine Compilers to translate this description to source code (technique like QT's UIC uses).
Surely the Qt3 dependence is a heritage since the project started in 2003, but nowadays pulling in Qt3 is something that repelled me from using the editor. Would be fine if Qt4 QStateMachine could be generated.