Motion Path Ultimate brings hands-on motion path editing directly into Blender’s 3D viewport.
This is a tool for animators who want fast, visual feedback when shaping movement arcs and keyframe transitions.

The addon makes it easy to visualize and refine animation timing and spacing. You can edit both bone and object motion paths interactively by dragging points directly or using viewport gizmos.
The addon supports handle-based editing, custom gizmos, as well as quick keyframe insertion and deletion with Alt + Click.
While Motion Path Ultimate offers excellent real-time control and a smooth viewport experience, its toolset focuses mainly on path manipulation. So it may not replace a full-featured animation graph editor.
Still, it can be an useful tool in the animator’s toolkit.