BetterPaths

BetterPaths is an editor tool for drawing paths and splines in the Unity scene view. Bezier paths are useful for things such as animating camera movement or designing waypoints for AI.
It distinguishes itself from the other path systems by using actual GameObjects as path points, not just editor elements. This among other things enables you to “f-focus” on points and easily manipulate your paths in complex game environments directly from the scene view.
You can also move and delete Points as you would a GameObject, and even move the entire hierarchy around by simply moving the parent.
Video and further information.