Shadertoy
shadertoy.com
The GLSL fragment shader archive
ShadersFreeGLSLWebGL
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The R3F standard library
Preview Drei inline
Loads the real site in a frame. Some sites block embedding — if it comes up blank, use Open instead.
Cameras, controls, loaders, shaders, text, environments. If you are writing it by hand in React Three Fiber, check whether Drei already ships it.
shadertoy.com
The GLSL fragment shader archive
threejs.org
The WebGL renderer everyone builds on
r3f.docs.pmnd.rs
Three.js as React components
by Poimandres@pmndrs