Photoscape - high quality photo editing software, that enables you to fix and enhance photos.
Online Image Editor - Online editor for images and animated gifs with multiple effects and tools
Pixelmator - Pixelmator is an image-editing application for Mac and iPad.
Pixelitor - Pixelitor is a cross-platform raster graphics editor written in Java.
Pixlr - Pixlr® makes it easy to transform everyday images into stunning works of art.
RealWorld Photos - RealWorld Photos is an free portable photo editor for Windows.