Particle Candy
Particle Candy is an extremely flexible yet simple and straightforward to use particle engine library to create all imaginable stuff of special effects in your games like smoke, trails, fire, explosions, debris, flares, dust, clouds, shots, light...
PhysicsEditor
PhysicsEditor is a GUI tool to create collision shapes within seconds! Without specifying any additional options PhysicsEditor already creates very good results, but you also have enough options available to adjust things to your needs.
ShapeEditor is an app for create collision shapes.