digiKam 5.9.0 is released
digikam.org
digikam.org
I tried every alternative I could find f-spot [1], shotwell [2], gthumb [3] and some more. Some alternatives without packages or updates in the last 5 years like mapivi and jbrout I didn't even try. Digikam was unstable at times and sometimes a bit on the slow side, but functions wise it went above and beyond anything the other programs had to offer (the only feature that was missing was sorting images by orientation and ratio). If at any point in time I'll be looking for an alternative to my current solution the first thing I will take a look at will be digiKam.
[1] http://f-spot.org/ (last update 2010)