Batch Gimp
Command line interface to GIMP scripting which enables processing of entire directories of images. Batch Gimp can be used to create many thumbnails, drop-shadows, or any other complex series of GIMP commands.
Contributions to The Gimp
Gray level gradients, alpha channel represents some mathematical function like Gaussian or exponential decay. Script-Fu scripts.
Edheldil's Gimp Page
Collection of scripts and plugins: Wax Seal, Wax Text, Sacnner, Sequence, Text Separate and Raw Plugin.
Jan Dittberner
The perl script can easily generate buttons for JavaScript rollover effects. You can also keep the .xcf files to work with them after creation. Since version 0.4.0 it is able to create the JavaScript and HTML code too. This version needs gimp 1.1.25 or later.
Nakhleh.net
Under the about me page find a Gimp-Perl script that takes high resolution images and generates web-resolution images and thumbnail images from them automatically.
Raphaël's GIMP Page
Provides "merge", a script that can be used to merge the background or top layer of an image with all other layers, while applying some optional effects such as translation or varying transparency.
Script-Fu (GIMP)
Script-Fu is the first (A TCL version exists now, also) GIMP scripting extension. Extensions are separate processes that communicate with the GIMP in the same way that plug-ins do.
Terry Brugger's Projects
Page of computer projects including a few simple script-fu's for logos and buttons.
Vidar Madsen's GIMPy Stuff
Fireanim.scm, fireanim-1.1.scm, fireanim-gradient: Useful if you want a background image.
WWWWolf's Scriptorium
Several tutorials, tips and tricks for the graphics program known as GIMP. Also Script-FU odds and ends by Weyfour WWWWolf, Urpo Lankinen.