For the physics design (creating the machines etc), we’re using the awesome useful Box2D editor R.U.B.E. If you’re working with Box2D, then your REALLY should get this tool, it’s saved me months of development time!
Most of the graphics in the game was created for us by Patrick Thompsson.
For the physics, we’re using Farseer Physics, a C# port and extension of Box2D.
We’re using MonoGame for the rendering parts, it’s a cross platform version of XNA.
Penny the Penguin
Penny the penguin by groundwater.