Lazy Bones is an experimental rigging tool kit for Blender, created by Blue Nile 3d. It supports Blender versions 4.3 through 5.0 and is released under the GPL license.
The add-on includes documentation, and a demo video is available for a closer look at the tool kit. Blue Nile 3d lists a version 2 as currently in a testing phase, and states that all coming updates are included with the product.
On the superhive marketplace, Lazy Bones holds a rating of 5 out of 5 across six ratings. Since it is described as experimental, the developer's page is the best place to check the current feature set, licensing terms and the status of version 2. The plugin is listed here as free, so confirm current licensing directly with Blue Nile 3d.