techZilo lists Top 40+ GIMP plugins. Some of my favourites were also included:
DeNoise – Noise reduction plugin using a modified Gaussian blur algorithm.
DustCleaner – Detect and remove the dust spots in digital image.
Colour saturation – Change the color saturation of your image.
Much like Firefox, GIMP’s strength lies in its plugins, which are developed by the open-source toting community. Since the users themselves develop them, they know all the needs and conceive a plugin for everything (well, except making a coffee for you 
).
