This script tries to fix the tone of a photo taken with wrong exposure. In some landscape photos, it can have a nice effect of enhancing the colors.
The general idea is to produce different copies of the image at different gamma levels, then applying simple tone mapping techniques to produce a vibrant photo.
The script allows the user to control the number of copies by setting the lowest and highest gamma setting then the interval. For example lowest=20, highest=170, interval=10 results to (170-20)/10 = 15 copies with increasing gamma level from 0.2 to 1.7. Play around! read more »
This is a script that is based on the fire tutorial (http://gug.sunsite.dk/tutorials/tomcat13/). It was built and tested on GIMP 2.4 (so, using the new scheme engine).
It comes with two versions; one that creates an image of flames and another that creates an animation (using layers as frames).

Creates a diffraction pattern using a circular gradient and the foreground and background colours.
Creates an image of rainbow coloured circles to give a plasma-like pattern. Also comes with an animation script that animates the pattern. Frames are saved as layers. Choose min and max speed and circles are randomly increases/decreased in radius according to the set speeds.
TODO - Save frames as XCF files compatible with GAP. read more »
This is a script that is based on the lightning tutorial (http://gug.sunsite.dk/tutorials/tomcat9/). It was tested on GIMP 2.4 (so, using the new scheme engine).
It comes with two versions; one that creates an image of lightning and another that creates an animation (using layers as frames) of lightning with parameters to modify the turbulence so the lightning bolt appears to dissipate over time.

This is a compilation of some wonderfull scripts of Iccii and some other scripts I 've made myself, all brought together is one script-fu file to make the installation very simple.
Contains : Cartoon, Color pencil, Conte crayon, Cutout, Drawing, Inkpen, Note Paper, Paint dot image, Palette knife, Pastel, Stamp, Water paint effect, (plastic) Wrap effect. Angled strokes, Crosshatched, Chrome image, Cross light, Funky color, Soft focus, Solarisation, Brick wall, Patchwork, Stained glass, Texturizer, High pass, Scroll, ... read more »
This script (originally by Iccii) implements the effects: add border, bevel and emboss, color overlay, drop shadow, gradient overlay, inner glow, inner shadow, outer glow, pattern overlay, satin.
It works when applied on a (transparent) layer or on a textlayer, but not on the background-layer . The layers are linked so the object can be moved around.
The latest version is tested on GIMP 2.4.
See webpage with examples http://users.telenet.be/ev1/gimplayereffects_en.html
This is a minimal python plugin for GIMP. In contrary to gimpfu-based ones, these do have the functions also available in C plugins (query, init, run, quit) and can (actually, have to) use GTK+ directly to create a user interface.
minimal-really.py
I've attached an minimal-really.py plugin, which does only define what is needed for a plugin (query, and the functions to be used). 99% of all python plug-ins will most likely follow this structure.
minimal-real.py read more »