Polyfjord

Simple Audio Visualizer is a Blender add-on by Polyfjord that generates animated cubes from a selected audio file, or animates your own objects to that audio's spectrum, controlled from a panel in the Graph Editor sidebar.

Simple Bounce Curve is a Blender add-on that creates a bounce curve connecting selected objects based on their origin. The curve height is adjustable, and you can refine the control point handles in Edit Mode.