I have a DSLR (Canon 550D) and since I'm taking my first steps in the world of RAW photography I don't know which would be a good program to use to edit these files. I've tried digiKam and GIMP but wasn't satisfied. I'm sure there must be better software out there...
I like rawtherapee. You may want to give it a shot. There is also UFRaw, but I personally don't like it as much.
sudo apt-get install rawtherapee
sudo apt-get install ufraw
The Gimp. To install it run:
sudo apt-get install gimp