Fixed timestep interpolation nodes for both 3D and 2D.
Godot defaults to a fixed timestep for physics. As physics tick rate and frame rate are independent, you will get jitter in any situation where these do not match. The standard solution to this problem is fixed timestep interpolation.
This addon introduces 2 new nodes, Smoothing and Smoothing2D, which simplify the process of adding fixed timestep interpolation to your game.