GLSL Hacker is a free and platform independent application for developers and 3D artists to perform quick realtime 3D prototyping and coding.
GLSL Hacker was written in popular standard languages such as Python, Lua and GLSL (OpenGL Shading Language).
To load and play a 3D scene (source code file) simply drag and drop it onto GLSL Hacker or load it.
GLSL Hacker is cross-platform and it works on Mac OS X, Windows and Linux. Binaries for the Windows and Linux platforms are available on the project's homepage.
Detailed instructions on how to install and use the GLSL Hacker utility on your Mac are available HERE.