scripting - How to check if a bone layer is empty with python - Blender Stack Exchange
Bone Manager (Addon) - Released Scripts and Themes - Blender Artists Community
Skeleton — Blender Manual
Bone Manager (Addon) - Released Scripts and Themes - Blender Artists Community
I feel like I am missing something with adding bone layers. - CG Cookie
Bone Layer Manager Add-on - BlenderNation
BoneDynamics Pro - Blender Market
Rig Anything with Rigify #7 Rigify Bone Groups and Layers | CGDive
Unlimited (Pseudo) Bone Layers - Released Scripts and Themes - Blender Artists Community
Bone Manager (Addon) - Released Scripts and Themes - Blender Artists Community
Relations — Blender Manual
The MHX rig | Thomas@MakeHuman
I feel like I am missing something with adding bone layers. - CG Cookie
Bone layer management addon for Blender 2.78? - Animation and Rigging - Blender Artists Community
Bonera - Blender Market
Rename some Rigify layer names - Blender Stack Exchange
What is the difference between Bone Layers and Bone Groups? - Blender Stack Exchange
GitHub - Pauan/blender-rigid-body-bones: Blender Addon which adds rigid body / spring physics to bones
Rigging a Removable Hat - BlenderNation
armature - Bone Layers in Edit Mode are Different Than in Pose Mode - Blender Stack Exchange
Protected armature layers – Urchin
I feel like I am missing something with adding bone layers. - CG Cookie
Blender: ボーンレイヤー（Bone Layers）の使用方法 | reflectorange.net
