Me too
I'm a Linux user, too.
Currently, I run Linux Mint 13 "Maya" (64 bit) with XFCE 4, my favourite desktop software, on my Linux box.
Raw development is done with SIGMA Photo Pro 4.2(.2.0), by support of wine. Unfortunately, the histogram vanishes from time to time; collapsing and re-expanding the settings window makes it appear again.
I tried SPP 5 also but wasn't happy with it due to its ugly GUI.
For whatever cannot be done in SPP, I use The Gimp 2.6 (oh yes, 2.8 is much better).
I have been using Linux since the advent of S.u.S.E Linux 5.0 (June 1997). There had been some occasional fall-backs to M$ Windoze. Presently, however, I am 'clean'.