Circular Gravity Force Pro allows you to easily manipulate physics in Unity 3D withno code required. 

DEMOS: PC, MAC 

CGF Pro Features Include: 
- Full 3D/2D Support
- Four Different Physics Shapes: Sphere, Box, Capsule, and Raycast
- Five Different Force Types: Force at Point, Force, Torque, Explosion Force, andGravitational Attraction
- Four Different Force Modes: Force, Impulse, Velocity Change, and Acceleration
- Non-Alloc Physics Support
- Demo Scenes Car, Car 2D, FPS, Hand, Hovercraft, Menu, Pinart, Planets, Planets 2D, Rocket, Rocket 2D, Vortex, Vortex 2D, Homing, and Pivot.
- GameObject, Tag, Layer, and Triggerfiltering
- High Performance and Low Memory
- Fully Customized GUI, Gizmos, andHandles for CGF objects
- Special Effects
- CGF Wizard Window
- Full Source Code
- No DLLs

CGF Pro makes it incredibly easy to create and invent cars, rockets, explosions, cannons, magnets, vortexes, hovercars, planets... the possibilities are endless! The demo's and tutorials show just how easy and powerful this package can be. 

VIDEOS: BASIC, ADVANCED, CAR, ROCKET,BALL, HOVERCRAFT, PLANET, FILTERING 

OTHER LINKS: 
Unity Forum
CGF Website
Resurgam Studios