100% Procedural 2.8 Material…just for you…all! - BlenderNation
Wood material for Blender (no UV's needed) by Nikola3D on DeviantArt
Cycles bevel node Set on Wood texture - Materials and Textures - Blender Artists Community
Wood Shader For Blender - 3D Material or Shader by Blenduffo
Mahogany wood procedural material issues - Materials and Textures - Blender Artists Community
Wood shader - Blender Market
Chocofur Free Wood Shaders - Free Blender and Cycles Wooden Shaders created by Chocofur! Improve your interior visualization renderings using our Cycles shaders and textures.
Everything 3D: A fine procedural wood material for Cycles—Dissected
GSOC: Texture Node Editor :Discussion and Suggestion - Summer of Code - Blender Developer Talk