Smart-Bones is an add-on for Blender that automates the process of adding action constraints to keyed bones within a selected action.

Included Files
Python script / addon : blender-smart-bones.py

Character demonstration 01: Character-blue.blend

Character demonstration 02: Character-orange.blend

To see how to use this addon see this video.

Installation
Download the SmartBones.py file from the Github repository.
Open Blender and go to ‘Edit > Preferences > Add-ons’.
Click on ‘Install…’ and select the downloaded blender-smart-bones.py file.
Make sure that the checkmark next to the add-on is enabled.
Click on ‘Save Preferences’.
Usage
Select the armature you want to add constraints to.
In the ‘3D View’, go to the ‘Smart Bones’ tab.
In the ‘Smart Bone panel’, select the ‘target armature’, ‘control bone’, and the ‘transform channel’ for the constraint.
Choose the ‘transform space’ from the drop-down list.
If you select ‘CUSTOM’ in the space option, specify the name of the object you want to take local space from. And if this object is an armature, then choose the ‘custom subtarget’.
Set the ‘minimum’ and ‘maximum’ values for the transform range.
Specify the name of the affected action, as well as the start and end frames for the action.
Click on the ‘Add Smart Bone’ button to add the action constraint to all bones in the action.
Properties
Target: the name of the control armature.
Control: the name of the control bone.
Channel: the control axis.
Space: the transform space, either ‘WORLD, CUSTOM, or LOCAL’.
Space Object (‘CUSTOM’ space only): takes local space from another object, to apply to constraint.
Space Subtarget (Only if ‘Space Object’ is an armature): custom space bone.
Min Transform Range: the minimum transform value, corresponding to ‘Min Frame’ of the selected action.
Max Transform Range: the maximum transform value, corresponding to ‘Max Frame’ of the selected action.
Action: the name of the affected action.
Min Frame: the start frame of the action.
Max Frame: the end frame of the action.
Operators
Add Smart Bone: adds action constraints to all bones in the selected action.
Delete Smart Bone: deletes action constraints with matching action name and control target.
Compatibility
The add-on is compatible with Blender 2.80 and newer versions. 

Downloads: show love to dev by purchasing if you can afford it

IF THE LINKS ARENT WORKING, THEN PLEASE ACT LIKE A GROWN UP AND MESSAGE ME/ COMMENT HERE OR ON DISCORD AND I WILL UPDATE THESE LINKS QUICKLY! MAKE SURE YOU DOWNLOADING PROPER FILE WITH PROPER EXTENSION LIKE .ZIP OR .RAR

Filename:smart-bones-main vfxMed.zip

Official Discord : https://discord.gg/M2kqB4M9tG

Recommended link below => FULL SPEED.

USE IDM FOR FASTER DOWNLOAD.

https://www.file-upload.org/kut1hcp9vijg

MIRRORS:

for mega and g drive links – contact admin.