https://blendermarket.com/products/smartify-nodes

A drag-&-drop solution to add environmental effects to your PBR materials, and the building blocks to kickstart your own smart materials.
Pick one of the smart effects in the library, and drop-it on any of your materials. You can add moss, snow, dust, sand, leaks, water puddles, dead leaves, edge-wear, alien-growth ect.. And of course customize their parameters in a few clicks. Or create any other environmental effect by simply switching Shaders/textures with other ones in the Smartify library, or with your own.
You can also quickly create from scratch smart-effects/materials using the building blocks of Smartify in the library, smart masks like Facing, location, Ao, edges, leaking, and smart utilities like anti-tile, paralax mapping, random-per-object.