Yasper - process modeler and simulator

Today I have found a very interesting application: Yasper (Yet Another Smart Process EditoR), free tool for modelling and simulating processes using a bit enhanced Petri nets. I haven't yet discovered all function Yasper provides, but it has a very easy to use model editor and a nice simulator (!!!). After defining your process you can see how it works and visually debug it, spotting problems before implementing anything. I feel the tool is a great companion to NGinn as currently there's no simulator for NGinn - what is important here, Yasper and NGinn are using basically the same process model so porting a model from Yasper to NGinn is straightforward.
Yasper is available from http://www.yasper.org/. I recommend it to everyone interested in process modelling.

The image below shows an example process I have tested with Yasper (click to enlarge):