Blender 2.81 Add-on Overview: Sculpt Alphas Manager (Free)

OnlineRender writes:

A new add-on was just recently posted on BlenderArtist by the developer Ryxx that enables you to categorize and organize alpha maps for use in Sculpting.

Blurb from Blender Artists

This addon provides a simple solution to be able to quickly switch alpha textures for the sculpt brushes. Once the addon is enabled, you have to be in Sculpt Mode, then go to Properties Editor Active Tool tab Texture Panel.