(different guy using the same user name) I am looking for a simple engineering software to model crank and rocker, gear, crank and slider, worm gear, scotch yoke, cam and other generic mechanisms. Most important is crank and rocker. Maybe some hydraulics and pneumatics. Something my celeron D 512mb can handle. Takes too much time to model this on paper. Aint do this in years. Free or not free, I don't mind at this point. Thanks.