Windows binary for this new plugin by Arel Welgan.
Source has been fixed for Windows compilation by Samj. Plugin no longer crashes under Windows.
Please note that all comments below, prior to Nov 28 2009 are related to another build not to this
that seems working well with RGB and RGBA images
Extract colour-match.exe from the ZIP archive and copy it to your c:\Documents and Settings\[user name]\.gimp-2.6\plug-ins\
(As Windows compilation by Samj was perfect, I kept it in the archive. Mine was several bytes larger...)
Easily map colours from a source colour to a target colour. Very effective for matching skin tones across images or between people.
Relatively quick (but not earth shattering). It doesn't work with grayscale or indexed images. Has preview, works with selections and layers, etc. Very, easy to use, and quite useful for portraits or recolouring graphics.

A demonstration: Lenna's face is mapped to the colour of the feather on her hat. This was done by selecting a colour from her face, then selecting a colour from the feather. read more »
Version 2.4
This Script-Fu creates a completely new image having an RGB and/or HSV gradient in two directions - both horizontally and vertically - based on the colors you specify for the four corners. The layer name includes the parameters to support reproducibility.
Superceded as of 4/26/09 by 2-Dimensional Gradient.
Version 2.4: layer name color parameters shown in hex to facilitate copying into color widget. read more »
The G'MIC plug-in for GIMP proposes a set of various filters to apply on your images, including artistic effects, image denoising and enhancement algorithms, 3D renderers, etc.. It is a quite large plug-in, integrating a lot of different effects.
This plug-in is able to :
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