100 Ideas That Changed Photography + Faking It: A Visual History of 150 Years of Image Manipulation Before Photoshop

100 Ideas That Changed Photography at http://www.brainpickings.org/index.php/2012/10/24/100-ideas-that-changed-photography/

Faking It: A Visual History of 150 Years of Image Manipulation Before Photoshop at http://www.brainpickings.org/index.php/2012/10/23/faking-it-met/

Gimp

GIMP is the GNU Image Manipulation Program. It is a freely distributed piece of software for such tasks as photo retouching, image composition and image authoring. It works on many operating systems, in many languages.

http://www.gimp.org/
http://gimp.lisanet.de/Website/Download.html

Dove: Evolution

http://en.wikipedia.org/wiki/Evolution_(advertisement)