DigiKam Software Collection 4.12.0 is an advanced digital photo management application for Linux, Windows, and Mac-OSX, which makes importing and organizing digital photos a snap. This new release comes with OSX PKG installers for Mountain Lion, Maverick, and Yosemite. Note that you must considerate digiKam under OSX as beta stage, not stable as under Linux.
Source DigiKam Homepage.
To install DigiKam just run the following commands via your systems Terminal.
sudo apt-add-repository ppa:philip5/extra
sudo apt-get update
sudo apt-get install digikam
That's it enjoy!