Todor Nikolov writes:
In this video, I reviewed 5 popular Blender addons. There is a quick start guide for each one as well.
-FaceIt (facial mocap)
-X-Muscle System (muscle simulation)
-Bonedynamics Pro (dynamic bones)
-Rigify Animbox (a set of tools that work with Rigify)
-Animation Layers (improved animation layering based on Blender's NLA)