Pandora simplifies the process of stitching together a sequence of panorama images.
Load all the panorama pieces (in order) as layers inside an image (suggestion: make a new image then "Open as Layers" and select all the files). Then run Filters->Combine->Make Panorama.
You still have to do the detailed matching by hand, but Pandora calculates the needed image size, moves all the layers to approximately the right position and creates appropriate layer masks for fading each image into the next.
TESEO2: Turn the Eldest Seismograms in the Electronic Original Ones Teseo2 has been developed for quick and accurate digitisation of historical seismograms from raster files, introducing a vectorisation step based on piecewise cubic Bezier curves. The vectoriser can handle greyscale images stored in a suitable file format and it offers three concurrent vectorisation methods: manual, automatic by colour selection, and automatic by neural networks. Teseo2 is developed in respect to the "Open-Source" philosophy and it is freely distributed under GPL license.
Plugin to load Photoshop ABR brushes as image in GIMP. Multiple brushes included in a file are loaded as layers. Should handle v1, v2, v6.1 and v6.2 sample brushes (though I don't known which PS release create each). Requires Gimp 2.4.
A script to create a border around an image. Border can contains additional lines (inner and outer). Size of lines and distance to image/border can be set independently. The bottom border can be extended and can contains text. There is no auto extension according to text size. The text is always in the middle of the bottom border.
(based on Eg-Border.scm script)
NOTE: I've created a new version in python and this version have much more functionality and uses own dialog, so it fits to screen ;-) Check it at: http://registry.gimp.org/node/24784.
This plugin does a pretty good job of eliminating shadows and highlights in photographs. It gives you two layers that basically act like adjustment layers, and changing the opacity will alter the effect.