PhotoKit-EL 3 

PhotoKit-EL gives you all the wonders of a darkroom without the chemicals, letting you achieve the same effects on digital images that you once could only do in a darkroom.
adobe photoshop elements elements color balance adjustment conversion to grayscale image sharpening graduated tone adjustments color correction image adjustment image correction camera raw

PhotoKit-EL 

PhotoKit-EL gives you all the wonders of a darkroom without the chemicals, letting you achieve the same effects on digital images that you once could only do in a darkroom.
adobe photoshop elements elements color balance adjustment conversion to grayscale image sharpening graduated tone adjustments color correction image adjustment image correction camera raw

JPEG Imager 

An interactive image compressor. Provides various compression controls and a real-time preview of a resulting image. May prove to be very useful if you need to optimize your images for publishing in the Web. Includes a set of image enhancement tools.
compress optimize jpeg jpg gif png view edit convert picture image process enhance correct