All Bone-constraints

Blender Development Fund
Asset Library
Blender Development Fund
Asset Library
Object References
$7

Tesselune in Addons

Zanden Tools Lite
$1

Zanden Gremlin Studios in Addons

Rig a Character in Blender: Rigging Fundamentals (5.2 LTS)
$39.99

CG Cookie in Training

Zanden's Tools
$10

Zanden Gremlin Studios in Addons

Animation Snapper Pro - Switcher
$9.99 Dev Fund Contributor

Melowilo Animation LTD in Addons