Shadertoy
shadertoy.com
The GLSL fragment shader archive
ShadersFreeGLSLWebGL
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Zero-dependency animated shader backgrounds
Preview Paper Shaders inline
Loads the real site in a frame. Some sites block embedding — if it comes up blank, use Open instead.
Drop-in shader components — mesh gradients, grain, dithering, warp — with a live editor that produces the exact props. Lightweight enough for a marketing hero.
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