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Shadertoy - Build shaders, share them, and learn from the best community.
Shader Editor - Android app to create GLSL shaders and use them as live wallpaper
The Book of Shaders - Extensive guide through fragment shaders with live coding examples
GLSL Sandbox - An online GSGL Shader Gallery and live development tool.
KodeLife - Real-time GPU shader editor, live-code performance tool and graphics prototyping sketchpad.
GSN Composer - The GSN Composer is a free web application intended for rapid prototyping and interactive demonstrations.