VirtualShade writes:

Hi, I’m a hobbyist CG artist who creates textures for 3d rendering. I’ve created over 50 free materials by now, which you can download for free on virtualshade.tumblr.com.

All texture sets include the necessary maps to recreate a photorealistic material, such as the Albedo, Ambient Occlusion, Roughness, Height and Normal Maps.

I have also recently started adding scanned materials, which is something I am still trying to improve upon...