The only one that comes to mind straight away is
Luce a compiled plugin.
http://reddog.s35.xrea.com/wiki/CategoryGimpPlugin.html in the section
Luce for GIMP. Versions for Windows / Linux / OSX With a bit of luck the osx version might work with your installation.
Example shown in screenshot. Click in the preview window to move the source and change the effect.
The little yellow "sunburst" Put that in because even an unlikely script might work, depends what you want to do.
elsamuko-escape-lines.scm
Edit Not that One
It is line-nova.scm Find it in
Filters -> Render Does require a little work on the users part.