Constructor Addon is a procedural generator for Blender built around geometry nodes. It focuses on generating a variety of procedural animations, described by the developer as unique and dynamic, all driven through Blender's node system.
The addon covers Blender versions 4.0 through 4.5 and works with both the Cycles and Eevee render engines, so the animations it produces can be rendered in either. It ships under the GPL license, and documentation is included with the addon. A demo video is also available for those who want to see the addon before installing.
Constructor Addon is published by Blender Procedural and listed in the superhive library. It centers on procedural animation through geometry nodes, and the developer's page carries the latest documentation and licensing details.