A while back I mentioned that I was working on a GLSL designer/development tool. I started this because most other GLSL development tools (apart from the one on OSX), are no longer being maintained and in some cases, no longer run on Windows 7.
So today I am going to release version 0.1a of my current GLSL Shader Developer build. The software is entirely written in Java and a JOGL install is required, but that is fairly simple and instructions as well as the libraries can be found on https://jogl.dev.java.net/.
Check out the new Software page, link is in the above menu, and feel free to give it a run.