我以为我会当一辈子当二次元.
Asset Stores
Unity Asset Store is Unity’s official store, where you can find free or paid assets and packages.
DevAssets is crowdsourced by developers, their website says: “Pay what you want or grab it for free”.
3D Models
Sketchfab has a thriving community of creators and many categories for you to choose new assets that will help you to bring your ideas into existence.
Turbo Squid is part of Shutterstock, it provides world-class 3D models.
3DWarehouse works seamlessly with SketchUp. It is specialized in architecture, design, and construction models.
Free3D contains a wide range of selections: architecture, animals, anatomy, furniture, food, and much more.
Poly Haven is a public library with CC0 (basically public domain, free for any use) models, HDRI, and textures.
Characters Creation
ReadyPlayer is a web-based tool to create 3D humanoid characters using a photo.
MakeHuman is open-source software to create 3D characters.
Rigged Models and Animation
Mixamo is owned by Adobe, and it comes with a long history and a vibrant creator community. In there you will find characters, rigged models, and animation.
Textures
GameTextures contains 3D textures, some of which are customizable. A great texture can breathe life into a plain scene.
Poly Haven has, on top of 3D models, a great selection of CC0 textures.
Audio
FreesSound contains a vast library of free sound effects.