A pack of free materials called Surfaces Lite.
Remember Surfaces Pro? A pack of 96 materials for Unity users? Great news! The developers have released a free version with 12 high-quality PBR materials.
The project is still in development and more material will be added in the future, so stay tuned.
Get Surfaces Lite
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You can always upgrade for $ 14.99 and get more than 96 surfaces. The creators update the library with more than 20 new materials every 15 days, so the pack is definitely worth it. You can follow the progress on Facebook or send them an email to request a new material.