you may download the windows executable for pluginviewer v1.0, or the source code (microsoft visual c++ 6.0).
at one stage, there was a macintosh port planned. however, both programmers who have started working on it have given up. not from any kind of hideous coding problems, I assure you, just a simple lack of time. if you want to take a stab at it, feel free! drop me a line if you have any questions concerning pluginviewer.
ps: if you're wondering how it's done, it's based on the ROAM algorithm. there is a brief explanation in the readme file.