GIMP Plugin Registry

Creates an outer border of the image with reduced brightness and 2 inner colours.

Uses one colour for the highlights and another for the shadows.

Script Tutorial: http://xoomer.alice.it/lwcon/gimp/script-fu/draw-line-trat.htm

The wavelet denoise plugin is a tool to selectively reduce noise in individual channels of an image with optional RGB<->YCbCr conversion. It has a user inteface to adjust the amount of denoising applied. The wavelet nature of the algorithm makes the processing quite fast.  read more »

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This Shadow&Highlight script does a decent job of lightening shadows and/or darken highlights in photographs. The UI gives you five control sliders. Two for control of the Shadow and Highlight amount (opacity), two for the tonal width of each contrast mask layer (using gamma), and one for the blur radius of the masks. Plus the option to flatten visible layers when done.  read more »

To be easier is the install of Python support in Gimp 2.4 in Windows XP or VISTA
Easier because here there is everything needed , (step by step how to included) all in a single pack.

So Install python for Gimp may is simple as double click on a installer.. only that has to be done 5 times, and during the process the computer restated twice...

But again "how to " is included and is step by step

DOWNLOAD LINK
http://photocomix-resources.deviantart.com/art/Gimp-Python-support-easie...

. -NOTE-  read more »

there is a pre-compiled windows version of this well know plugin but was available only from a Japanese webside.
( http://www.geocities.jp/gimproject/gimp2.0.html )
For windows user that don't read Japonize ideograms, and do not know how to compile by source i found useful
mirror here
DOWNLOAD LINK
http://photocomix-resources.deviantart.com/art/Refocus-plugin-windows-OS...

please for source code, versions for other OS, more info and updates refer to the developer page
http://refocus.sourceforge.net/

For some reason the freetype plugin, quite useful to edit text and fonts, was removed from gimp-2.4 , and many miss it Work well with Gimp-2.4 (at least on Windows OS)
The windows users that don't know how to compile by source , may found it here http://photocomix-resources.deviantart.com/art/Lost-Found-Gimp-Freetype-...
ready to be installed

For source code , version for others OS and possible updates please refer to the developer side (www.freetype.org ) i'm just mirroring the windows binary because are hard to find