Vmats is a realistic and high quality material library for Blender. It comes with lots of materials for Cycles and Eevee.
Vmats for Cycles has 1610 materials, Vmats for Eevee has 1546 materials.
CYCLES MATERIAL EXAMPLES (Model by Mike Pan):
EEVEE MATERIAL EXAMPLES (Model by C&C Studio)
I would be grateful for your feedbacks.