Image editor: panorama, HDR composite, change brightness
distribution, intensify colors, reduce haze, resize, rotate (any
angle), crop, red-eye removal, sharpen, reduce noise, edit and search
tags, thumbnail image browser and navigator.

About this version

+ invert selected area: subsequent edits modify all but the selected area

+ tags edit: assign “star” ratings to images, search by star rating

+ translation system converted to use Gnu gettext (the Linux norm)

+ user guide reorganized to be more friendly to the RTFM inhibited

+ added auto-crop button to rotate

+ corrected minor bug in color-intensify function

+ fixed slow mouse tracking problem for PCs with slow graphics

read more here