Online Image Editor - Online editor for images and animated gifs with multiple effects and tools
PixBuilder - Free Photo Editing Software for PC
Pixelitor - Pixelitor is a cross-platform raster graphics editor written in Java.
showFoto - ShowFoto is the standalone image editor of the digiKam project.
RealWorld Photos - RealWorld Photos is an free portable photo editor for Windows.
Fotografix - In addition to being totally portable, Fotografix has a ridiculously small footprint.