Darktable is a virtual lighttable and darkroom for photographers: it manages your digital negatives in a database and lets you view them through a zoomable light table. It also enables you to develop raw images and enhance them.
- non-destructive raw photography workflow tool
- floating point accuracy accelerated by SIMD and OpenCL
While DT (using 1.4 now) is a capable Raw processor, its cryptic interface makes it hard to use. Lacks a good export module and you cannot print from it. It also lacks a proper top menu (I'm using the Ubuntu version) so you are forced to quit by clicking the (X) button of the window. Along the same concept, Photivo is much easier and feature laden. I had "high expectations" about DT but the developer seem to have lost momentum and bearing.