Photoscape - high quality photo editing software, that enables you to fix and enhance photos.
RealWorld Paint - RealWorld Paint is an free portable image/photo/animation editor.
JPEGView - JPEGView is a small and fast viewer/editor for JPEG, BMP, PNG, GIF and TIFF images.
JugiPaint - JugiPaint is a painting software with diverse tools for various types of illustration work.
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.
Paint +++ - Paint +++ is a native image editor for Mac that enables you to complete everyday image editing tasks in a single place.