http://www.20sim.com/product/20sim.html
20-sim is a modeling and simulation program that runs under Microsoft Windows.
With 20-sim you can simulate the behavior of dynamic systems, such as electrical, mechanical and hydraulic systems or any combination of these.
20-sim fully supports graphical modeling, allowing to design and analyze dynamic systems in a intuitive and user friendly way, without compromising power.
20-sim supports the use of components.
This allows you to enter models as in an engineering sketch:
by choosing components from the library and connecting them, your engineering scheme is actually rebuilt, without entering a single line of math !
dl(~77MB): http://www.megaupload.com/?d=3UMZ2TRD
password for unpack:SaleZ