How to install plug-in in Gimp on OS X?

Solution 1:

You'll find the appropriate folders at /Users/username/Library/Application Support/Gimp/. There go in the scripts folder and the presets go in the gimpressionist folder

I found these locations by looking at the GIMP preferences, and clicking on Scripts. The locations cited above were listed there.

Solution 2:

There are OS X instructions in the GIMP documentation and they suggest installing GIMP from fink or macports. Do this and you can follow the Linux/Unix instructions for plugin installation. Otherwise, the documentation states "good luck" if you install it some other way.

However, searching http://gimper.net suggests that, for a Python plugin, you should put it in: [your home]/Library/Applications Support/Gimp/plug-ins (create directory if necessary).