LightPainter is a Blender add-on from ShaderError for painting cinematic light directly in Blender's viewport. With brush-based control, you shape gobos, highlights, and shadows, an approach the developer frames as a new way to design lighting.
The add-on uses the Cycles render engine and is a Blender Extension, compatible with Blender 3.6 through 5.1. It's released under the GPL license, and documentation is included. A demo video is also available on the developer's page.
LightPainter appears in the superhive library, where it holds a five-star rating across eleven reviews and lists more than 2,000 sales. ShaderError is a Blender Development Fund contributor, and the add-on was published around seven months ago. For artists working on lighting in Blender, LightPainter offers a brush-driven route to placing gobos, highlights, and shadows in the scene.