Just found this via someone on Flickr.
It's a free photo management and editing software package, equivalent to Lightroom, but you don't have to pay Adobe anything.
DarktableIt will work with RAW files and also supports tethered shooting.
It's available on the GPL licence, so it's completely free.
Sadly it's only on Linux or MacOS, so I can't try it myself, but it looks alright.
Here's someone's screenshot of what their edit looked like:
Making Of: they can't take that away from me by
tatadbb, on Flickr
Worth checking out.