Aperture

Aperture 3 is available on the Mac App Store

The trial version of Aperture is no longer available. If you currently have a copy of the Aperture 3 Trial installed on your Mac, you must delete it from your Applications folder before downloading Aperture 3 from the Mac App Store.

Aperture 3 requires a Mac with an Intel processor.
See Aperture 3 system requirements for details.