Shader Factory Online Editor
Shader Factory is a free to use OpenGL Shader Language Editor. Although this editor is just the first version, it is already filled with handy design features.
You can select between three objects to play with—plane, cube, and sphere. These shapes can be viewed in 3D.
To change the object’s color, you can tweak the RGB settings. There are also options for changing the texture and opacity.
The editor is made using HTML5 technology.
Start your shader experiments here.