Darktable is an open source photography work-flow application and RAW developer. A virtual lighttable and darkroom for photographers. It manages your digital negatives in a database, lets you view them through a zoomable lighttable and enables you to develop raw images and enhance them.
Darktable 2.0 has been ported to GTK+ 3. It features a new print mode, PDF exporting support, better HiDPI support, a new thumbnail cache, new image operations, new camera support, UI and scripting enhancements, and much more.
Here are the links for the latest version:
Ubuntu => <http://linuxg.net/install-darktable-on-ubuntu/>
Windows => Sorry, not available due to the lack of the Windows community willing to port the application!
For more details, see the official announcement and watch the video:
Announcement => <http://www.darktable.org/2015/12/darktable-2-0-released/>
Video => <https://youtu.be/VJbJ0btlui0>