PhotoQt, Copyright (C) 2013, Lukas Spies - latest version: 1.0
PhotoQt is already available in the repositories of some distributions. I'd recommend to first check there.
Otherwise you can have a look whether your distribution is listed here. You either get a file to download, or instructions on how to get PhotoQt onto your system.
I'm trying to keep this list always up-to-date, but since there are so many different distributions out there, I can't catch them all. So if you know of any information that is missing here, let me know!
Note, that after a new release it usually takes a little bit (usually only a couple days) before PhotoQt gets updated in the repositories, or before a new pre-packaged file is available. You can always compile the very latest version from source.
The languages usually get updated continuously. You can find the latest stable version including updated languages in this GitHub repository.
The latest (unstable!) development snapshot you can also find at GitHub.