The addon is free! But you can pay it to support development. <3

This addon allows to easily make an object shake in Blender, It work with bone, camera, object, [...]
It works with Blender 2.9.

Objects and Camera:

• In Blender select the object you want to shake.
• Execute operator VIEW_3D > OBJECT > Make active object shake
• Now go in custom properties to edit and animate the shake influence

Bones:

• In Blender select in Pose Mode the bone you want to shake
• Execute operator VIEW_3D > POSE > Make active bone shake
• Now go in custom properties to edit and animate the shake influence

For Blender 2.7:

• In Blender select the object you want to shake,
• press Space bar for and write "Makes active object shake"
• Now go in custom properties to edit and animate the shake influence