GIMP Plugin Registry

Three functions:
:: Crop to : Crop current layer to selected layer.
:: Crop images : Crop all opened images with current selected rectangle area
:: Intelligence : Think different way [Beta]

This plugin is by Bert Hinz. As his web site seems to be down, I'm archiving it here. It says it's "free software" (looks like part of the GPL Licence) so I'm assuming this is OK.  read more »

Transparency crop script by J R Hunt, updated by Darrell Enns to work with Gimp 2.6.
Automatically crops out transparent edges. This is particularly useful after performing a rotate or perspective correction on a photo. It can also perform optimizations to find the crop that removes the transparent edges while mainting as much of the original image as possible.

Make a blurry border around the selection and make everything else transparent. Designed for "highlighting" part of a screenshot or other large image.

This script crops the image so that the current selection winds up at the center of the image. It is especially useful when postprocessing digital images: When the subject of a photograph appears off-center, simply select the subject, click on Script-Fu/Selection/Center Selection..., optionally customize the script's parameters (described below), et voilà—the subject is now perfectly centered.  read more »