A color correction plug-in working in YCbCr space (should probably be ported to LAB) written as part of my final year project for a <bachelor degree in college. Provides an interface to change white-point, gray-point, black-point, saturation, levels. As well as integration with various automatic correction methods that let you tweak the controls further after setting a value.
mpeg screen capture of color correct, and auto white balance in action.
Color correct registers two menu entries image/layer/colors/color correct
Color correct used to register an automatic white balance entry in The GIMP's menu system as well, in 2.2 and later gimp provides it's own automatic white balance entry based on a slightly different algorithm.
Look in ./files for the latest version.