…Found something for Eclipse:
Maybe I should do that? The book is written for eclipse.
…Tracer… Also for Eclipse:
Maybe I should just… Use a separate program to edit my GLSL files:
This looks promising:
Original Thread: http://stackoverflow.com/questions/13624124/online-webgl-glsl-shader-editor
Thibaut Despoulain has an editor at http://shdr.bkcore.com/