ShaderPad is described as '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' and is an app in the development category. There are three alternatives to ShaderPad for Windows, Linux, Web-based and Self-Hosted. The best ShaderPad alternative is The Book of Shaders, which is free. Other great apps like ShaderPad are ShaderWorkshop and OpenGL Shader Designer.
The Book of Shaders provides a gentle, step-by-step guide through the abstract and complex universe of Fragment Shaders. Besides scores of insightful illustrations, the site includes a very intuitive live-coding editor for users to easily see changes as they code.
Shader Workship is an interactive GLSL fragment shader editor inspired by ShaderToy and built with Qt.
TyphoonLabs' OpenGL Shader Designer is an open-source shader development IDE created for writing vertex and fragment shaders in the OpenGL Shading Language (GLSL).
