Common

Gumroad

Unity Asset store

Unreal Marketplace

GameDev Market

Open Game Art

Super Game Assets

Sub Reddit : textures & Assets

Itch.io : Assets & Soundtracks

Game Gorillaz

Cubebrush

Cadnav

Materials & Textures

Substance Source

Joost 3D

Texture Haven

CC0 Texture

Render Man Pixel

ShareTextures

FreeBPR