C.Mats is a procedural material bundle for Blender, created by chery (also credited as Manu Chery). It brings together 90 procedural materials and two addons, and is distributed under a GPL license. The bundle has been published for over a year and lists more than 20 sales on Superhive.
The material set spans fabric, wood, metal, marble, and carpaint surfaces, along with 15 real and fictional planets. Two addons round out the package, including Dirtify 2.0, which targets realistic weathering. Documentation is provided, and a demo video is available.
Compatibility covers a broad span of Blender versions, from 3.0 through 4.3, including the entire 3.x series and 4.0, 4.1, 4.2, and 4.3. C.Mats brings procedural materials, planet materials, and the Dirtify 2.0 weathering addon together in one package. For current licensing and download details, visit the developer's page.