This tool can help you edit online and you can see the differences of shader and glsl type source code and now it comes with news.
I also presented this tool last year in April, it is quite old as an online tool.
The author of this online tool tells us:
Hi, my name is Andy. Almost 8 years ago, I created a tool called Shaderfrog. Shaderfrog is a Three.js shader editor and ‟composer.” Shaderfrog lets you author shader GLSL in nodes, and then combine them together using a graph editor.
See this online screenshot:
