A Newtonian gravity simulation. WASD to pan the camera Left and right arrows to change which object is currently focused (a value of 0 means the camera will not automatically focus on any object, a value of 1 will focus the first placed object, and so on). Click and drag to place an object, it will show a path that the object will go on. Change the mass of the objects you place with the mass slider. You can zoom in and out with the zoom slider. The accuracy slider changes how accurate the simulation is. A value of 1 isn't very accurate and will cause orbits to decay quickly, but a higher value produces more lag.
Just an upgrade of the previous gravity simulation I made. Sort of inspired by Universe Sandbox.