GIMP Stroke Path with Taper plugin
I have created a GIMP plugin that strokes a path with a taper (i.e. it creates a line with a start width and an end width, rather just a constant width). I was aware that our esteemed member, RobA, had already created such a plugin (script, actually), but my plugin has some extra options, such as fill style (color or pattern) and line style (cap/join styles).
The following image was created by making a path, then stroking it twice with my plugin using different colours and widths. I think the second stroke was 1.3 pixels thinner. So obviously, rivers are the main use for a plugin like this. But I guess you can also make lightning strokes as well.
A preview of the settings available is here.
My next plugin will be a Voronoi diagram generator. A lot of board game maps divide things up into irregular polygon regions, and Voronoi diagrams are a pretty easy way of doing this. If you have any ideas for GIMP plugins that would be useful for cartography let me know.