Apple's metadata filesystem - stores file metadata in seperate database, import for common and customized file metadata, sophisticated api and command line query
At this point it is an expensive and questionable alternative to Camera Raw, a free extension to Photoshop, and Adobe's Bridge which can batch produce better quality images in arguably less time.
S. Bisht, V. Rathi, G. Pant, and V. Verma. International Journal on Recent and Innovation Trends in Computing and Communication, 3 (4):
1934--1941(April 2015)
V. Bernau, H. Martin-Jung, and T. Riedl. sueddeutsche.de, (05.01.2011 2011)Parallele Printversion: Süddeutsche Zeitung, 5./6. Jan. 2011, S. 18 u.d.T.: Facebook gegen den Rest der Welt.