Blender Addons

Edit Bone Constraint - https://github.com/HolisticCoders/edit-bone-constraint
Bone Layer Manager - https://gumroad.com/l/STdb
Skin Selection - https://blendermarket.com/products/skin-selection 
Auto Rig Pro -  https://blendermarket.com/products/auto-rig-pro
Motiontrail3d - https://gumroad.com/l/motiontrail3d
Onion Skin - https://blendermarket.com/products/onion-skin-tools
Jiggle Armature - https://github.com/cheece/JiggleArmature 
Add keyer https://www.youtube.com/watch?v=QLwiaE7jQFE
Nla - https://www.blendernation.com/2018/07/14/free-add-on-nla-additive-animation-layers/ 
https://gumroad.com/l/hairtool 
https://www.blenderkit.com/get-blenderkit/ 
https://gumroad.com/l/dLiTn
https://gumroad.com/l/dLYcO
https://github.com/RootKiller/blender-smooth-anim-loops-addon
https://bleaf.tumblr.com/post/178809127234/oi-game-animators-and-mocap-people-someone-wrote?is_related_post=1 
Bone Widget - https://lollypopman.com/2016/09/26/addon-bone-widget/

https://www.blendermarket.com/products/ragdoll-tools
https://blendermarket.com/products/retopoflow/
http://nutti.github.io/Magic-UV/
http://renderhjs.net/textools/blender/
https://blendermarket.com/products/bpainter/
https://twitter.com/Muream/status/1125391855405928448 https://twitter.com/Muream/status/1125391855405928448