All Blender-material-library

Blender Development Fund
Asset Library
Blender Development Fund
Asset Library
Ultimate Asset Organizer - Materials V2
$14.90-$54.90 Dev Fund Contributor

Vertex 404 in Addons

67 Marble PBR Materials for Blender (Bonus - Realistic Seamless Textures (2K)
$0.00-$99.99

VK Gamedev in Surfacing

Maml | Mouval Automotive Material Library (100x)
$19.99-$39.99 Dev Fund Contributor

Damian Mathew in Surfacing

Easy Detail Materials.
$14.99-$24.99 Dev Fund Contributor

Oni in Surfacing

Vizpak SSS for Blender
$50 Dev Fund Contributor

Richard Yot in Surfacing