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CC0Textures.com offers you a library of free and (hopefully) high-quality textures and PBR materials for photorealistic rendering and game design.
Not a lot. All textures and maps on this website are released under the Creative Commons CC0 / Public Domain license. This means that you can use them for any kind of creative project - even commercially and even if the project requires redistribution of the textures as files (for example in a zip archive together with a model).
The Public Domain license states that you do not need to give credits when using these textures. However, I would appreciate it. You can mark @CC0Textures on Twitter and Instagram if you want to.