Compositor is Artly There’s 5 star rated product...an image to art program, an image editor, a web graphics helper...almost anything you wish.
Compositor has History, Snapshots, multiple clipboards, Brushes, Actions, a variety of selection tools, and an array of filters so large you can use them all day long, a month long, and still not exhaust the potentials. Gem finder, Fade Last, Curves, Levels, the list goes on.
As if October 13, 2016, Compositor is now FREEWARE.