Rawstudio is an open source raw-image converter written in GTK+.

Features:
* Read most raw file formats using RawSpeed and uses dcraw as fallback
* Supports DNG Camera profiles
* Tethered shooting
* Tagging
* Lens correction using LensFun
* Exporters for Facebook, Flickr and Picasa
* Internal 16bit rgb
* Various post-shot controls (white balance, saturation and exposure
  compensation among others)
* Realtime histogram
* Optimized for SSE (detected runtime)
* Easy sorting of images
* Fullscreen mode for better overview

Enjoy!