Normal Map Node Tools is a set of shader node groups for Blender, built to help with the manipulation, creation, and enhancement of normal map textures. The node groups cover common normal map operations.
The pack handles several tasks. Add Normal Map adds two or more different normal map textures, and Mix Normal Map mixes normal maps. Invert Normal Map flips a map, and Normal Map Intensity adjusts intensity. Height to Normal Map, Vector to Normal Map, and Image to Normal Map generate normal maps from other sources. Documentation is included.
It supports Blender versions 4.0, 3.6, 3.5, 3.4, and 3.3, and is offered under a royalty-free license. In this catalog it is listed as free, so check the developer's page for current licensing terms.