Aperture

Aperture is a photo editing software developed by Apple for the Mac OS X operating system in 2005. It was originally sold for $500USD, but now sells for $80USD on the Mac App Store. It has many tools for the professional photo editor, and it could be considered a highly extended version of iPhoto. Its features include:
 * non-destructive editing
 * face recognition
 * place recognition
 * brush effects (like dodge, burn, skin smoothing, etc.)
 * exporting to other websites like Facebook and Smugmug