Photoscape - high quality photo editing software, that enables you to fix and enhance photos.
miniPaint - Online graphics editing tool use HTML5 technologies like Canvas, Offline support, Drag and Drop.
JPEGView - JPEGView is a small and fast viewer/editor for JPEG, BMP, PNG, GIF and TIFF images.
RealWorld Paint - RealWorld Paint is an free portable image/photo/animation editor.
ACDSee - ACDSee is an image viewer that uses very little system resources, and it has a small, sleek size that won't take up much space on your system.
JugiPaint - JugiPaint is a painting software with diverse tools for various types of illustration work.