LiveQuartz Photo Edit 1.9

Free image edeting on Mac.
LiveQuartz makes layer management very easy. With its layers list, you can add, remove, drag, drop, re-order and merge layers in a very intuitive and non-destructive way.
LiveQuartz has all of its user interface in one window. Available tools settings appear as you select the tool.
Layers and Filters list can be hidden easily to have all the window space available for your photo.
LiveQuartz is born around the same time as CoreImage. Since then, LiveQuartz has a very powerful non-destructive filters list for each of its layers.
LiveQuartz 1.9 adds flip transformations and shadow filters.