AnimLooper is an easy to use Blender add-on for preparing motion captured animations for production. Its main feature is to alter animations so that they can be played on a loop without any seams.

Features

Looping
With just a couple clicks, you can make your animation start and end in the same way so that it can be looped with no seams. 

Before using this feature, make sure to cut the animation so that the start and end poses are similar. Too large of a difference can lead to artifacts.

Root manipulation
With the add-on you can easily manipulate root motion. The animation can be made to start at the center, or motion can entirely be removed if needed. These are useful features when exporting to a game engine.

Keyframe snapping
With a single click, keyframes can be snapped to exact frame positions. This is important for easy manipulation of the animation and for other software to interpret it correctly.

Playing animations
There is a convenient button for playing animations. It lets you choose from all available actions and automatically sets the proper frame range so that they can be previewed easily.