Recently, I had a great pleasure to work with one, truly talented, furniture designer Sergey Petlyakov and his company Interior Elements ( https://www.interiorelements.ru ).
While working on this project, I realised that it would be handy to have a base, starting point for anything wood related.
So, here you go - FREE pack of Wood materials for Maxwell Render. (All procedurally based, 4k, tile-able)
The Pack contains 7 MXM files.
Each material's setup is very basic - just 1 BSDF for base colour and another one to control roughness.
Get them here: https://drive.google.com/open?id=1EPBoeGi2QB083xeQNsCVRa-RvsyGKON6
Or here: https://gumroad.com/l/YzgL
Cheers.