GLSL Sandbox
An online GSGL Shader Gallery. You can freely add to it without an account.
Shdr
Shdr is a live ESSL (GLSL) shader editor, viewer and validator powered by WebGL and built by Thibaut Despoulain (BKcore).
Shadergif
ShaderGif is an open source home for art made with code. Make gifs with GLSL, Javascript and p5.js.
Shadertoy
Shadertoy is the first application to allow developers all over the globe to push pixels from code to screen using WebGL since ...