Lumina, Open Source GLSL editor

Lumina is an Open Source editor for the OpenGL Shading Language (GLSL). It is using Qt from Nokia (formerly Trolltech).

It should work on Windows, OSX and Linux. I have downloaded the sources and with some editing, I was able to compile in with Visual Studio 2005. I believe it was written to use the gcc-compiler.

http://lumina.sourceforge.net