I'm looking for some kind of tool to work with GLSL. I want to experiment with shaders in the WebGL application, so what I'm looking for is something like RenderMonkey. As far as I know - RenderMonkey is not supported anymore, so there must be some other tool that took it's place.
The best would be if I could do both the "effect composing" like RM and the raw GLSL code development.
Looking forward to see some nice answers.
In the meantime, I recommend having a play with ShaderToy and FractalLab