This is a paid asset, but now you can download Easy Spine 2D for FREE, but please remember this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
Easy Spine 2D v1.0
Easy to control skeleton animation Quickly to select animation/skin Mix skins together for instant results Search is used to find what you need quickly
Spine Tool Features
View animations
View skins
Run spine animation without play
Search animation or skin by name
Mix skins
Display frame, time with slider timeline
Auto run feature: play loop anim by time
Control auto run speed with speed slider bar
Change SkeletonDataAssets via tool
Quick jump to skeleton object in hierarchy by ping button (on the right check box auto run)