execution

OpenModelica zone

Keywords
If you use the Modelica Language for simulation it's basically a rite of passage to at least try out OpenModelica, although your mileage on various operating systems and versions thereof can vary wildly (you can always ask for the money back that you didn't pay).

Alf zone

Keywords

Alf - the Action Language for Foundation UML - is a UML-friendly textual "surface language" intended for use together with fUML. Useful for those tasks in Activity and StateMachine diagrams that don't lend themselves to graphical modelling.