Armature Deform Controls is a Blender add-on that maintains compatibility for existing assets from other DCC applications while letting artists weight, rig and animate in Blender in any way they choose. It is a tool for working with existing skeletal assets brought in from other software.
The add-on can quickly and easily set up bones that indirectly manipulate the source armature's original bones, but with Blender-friendly orientations for rigging and animation. When required, it can also bake animation between the control and deform bones.
It is part of Jim Kroovy's B.L.E.N.D add-on collection and is also included in Mr Mannequins Tools. Support is available through the B.L.E.N.D category on the developer's Discord server and via the GitHub issues, and documentation is provided. A demo video is available. The add-on is listed for Blender 2.93 under the GPL license.