I built a crude Box2d physics editor:http://sourceforge.net/project/showfile ... _id=197381
It's an ongoing project (latest version in CVS).. So far you can draw/place
Static lines (Ground)
Lines (thin boxes)
Pyramids with boxes
Pyramids with circles
Towers with boxes
Stairs (draw line)
1-9 and Q,W,E,R,T,Y pick options...
Z,X,C - increase/decrease sizes
A,S,D change density, friction, etc.
You press O to export the current scene into C++ source. Joints are supported, but I'm storing them so it's almost done.
Attractors/replusors (i.e black holes, magnets etc.)
Vector fields (ala Loco Roco)
I plan to add as many as features as possible then clean up the UI