Many companies use this software for editing photos.
I use this for our company work and this works perfectly for image editing process.
Limbo - “Dark, disturbing, yet eerily beautiful, Limbo is a world that deserves to be explored.” Joystiq. “Limbo is as close to perfect at what it does as a game can get.” Destructoid. Buy LIMBO: Special Edition.
GIMP - GIMP is a multiplatform photo manipulation tool.
Feist - Feist performs 'Century' featuring Stephen Colbert. Leonard Cohen Tribute at the Juno Awards. Pleasure Tour. The Making of Pleasure. x.
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.
World of Goo - get it here | read the blog | forum.
Krita - Krita is a professional FREE and open source painting program. It is made by artists that want to seaffordable art tools for everyone. Concept art. texture and matte painters, illustrations and comics.