
Adobe Photoshop
If you can think it, you can make it with Photoshop CC, the world’s best imaging and design app.
GIMP is a free program for such photo retouching, image composition and image authoring. Essentially it's the closest thing to Photoshop you can get for free.
GIMP is a freely distributed program for such tasks as photo retouching, image composition and image authoring. It can be used as a simple paint program, an expert quality photo retouching program, an online batch processing system, a mass production image renderer, an image format converter, and more.
Available also as portable app: http://portableapps.com/apps/graphics_pictures/gimp_portable
Customizable Extensible by Plugins/Extensions Portable Layers support Batch image manipulation Photo effects Retouch photos Open PSD files Layer manipulation Keyframe animation Scripting support Color to Alpha Symmetry brush
Productivity Games Social Phots and Graphics
customizable extensible portable image-editing layer-support xfce batch-image-manipulation photo-editing photo-effects photo-retouching psd-support layer-manipulation graphics-editor keyframe-animation architectural-photography scripting-support color-to-alpha perspective shift-lens symmetry-brush