GIMP Plugin Registry

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.

gimp-reflection extends lower section of an image as a reflection of the original image.

Download it here.