I'm on a Linux box (Ubuntu) and it came with the live CD so, I use the Gimp for anything "extensive" and Picasa for the "quickies". I'm anxiously awaiting a native Linux version of Picasa as the version that's out now runs through a Windows emulator. Works nicely but, not as nicely as it could/should. Has yet to fail finding my cameras, scanner or sd cards. So, all-in-all, I'm just as content as I was running PS or PSP when I used to run a Windows box (God... seems like AGES ago!)