Batch AutoCorrector 

Enhance all your digital images at once! This program can correct contrast and restore natural colors of multiple images automatically. Now it is very easy to correct shots taken in poor lighting, at sunset etc. New free tool from VicMan Software!
vicman auto color balance correction correct enhance cast contrast

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 tone adjustment color balance adjustment conversion to grayscale image sharpening graduated tone adjustments color correction image adjustment camera raw

Aurigma Graphics Mill 

Aurigma Graphics Mill 2.0 is a set of powerful, fast and memory-friendly components which resolves most of image processing tasks: load/save files of most popular formats, enhance, transform, display, reduce colors, combine images, draw imagery, etc.
image imaging vb asp graphics rotate resize effects sharpen blur jpeg tiff bmp wbmp