That program looks like a simplified zbrush with measuring tools. I wish zbrush had a better system for modeling to measurments. What that guy used was pretty much just a boolean. There wasn't anything for designing 'mechanical' joints for your toys. I seriously hope I don't have to get solidworks just to do this 1 thing...WIll have to see if it can even work with mesh data for that kind of mechanical analysis.
I'm using Rhino3d and Zbrush. I would like to k now what software folks are using to make jointed toys. I can pretty much test whether a joint is sound or not in Rhino but not without a lot of time. Is there a software that will allow you to rotate your pieces, track its movement and then tell you if and where your parts are colliding?