Sites and apps similar to The Book of Shaders include Bitspace, which is free and open source. Other options are Alma.sh, SHADERed, Shadertoy and Shader Editor. You're spoiled for choice with Code Editors like The Book of Shaders: we list more than 25 alternatives for Windows, self-hosting, Linux, iPhone and iPad.
Synthclipse is a GLSL shader prototyping tool. It makes possible to fast develop all kinds of shaders: Fragment (FS), Vertex (VS), Geometry (GS), Tessellation (TS) and Compute (CS). Shader development can be done using compatible with Fragmentarium and Shadertoy (but limited to...
ProtoShade is a GLSL:ES Shader Prototyping Utility for Android. Code shaders on mobile devices while a viewport renders the results transparently in the background.
ShaderPad is a lightweight, dependency-free library that reduces boilerplate when working with fragment shaders. It provides a simple interface for setup, texture and uniform management, and user interactions such as mouse movements and window resizing.
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