Phun - 2D physics sandbox
Phun is freakin' fun!! Draw physics enabled 2D object with your mouse and watch them react in the moment. Fiddle with your object's density, viscosity, elasticity and inertia. Knock things down, bounce them around, wade them through water & otherwise pleasurably and inventively pass time. Educational for kids and downright cool for the rest of us. Check out the video: http://www.youtube.com/watch?v=0H5g9VS0ENM. Phun is a student project by Emil Ernerfeldt. It's still in beta and requires Runtime Visual C++ 2005. Oh yeah- it's also FREE.