RenderMonkey
RenderMonkey™ Toolsuite | AMD Developer Central RenderMonkey is an integrated development environment (IDE) that can be used to write shaders in HLSL, GLSL, and GLES.
FX Composer
FX Composer is an integrated development environment (IDE) for authoring shaders. Shading languages it supports are HLSL, Cg, ...
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 ...