Linux: Ubuntu's next version will switch out the F-Spot photo manager for Shotwell, a young but promising tool. Want a better tool than either of them? Try gThumb, which does well at importing, viewing, organising and lightly editing your shots.
If using WINE to install the newest Picasa in Linux isn't your cup of tea, installing the light, agile, good-enough gThumb editor might be the next best option. It's smart about importing the right pictures from a camera or smartphone, has tagging and manual album organising, offers the basic editing tools of Picasa and feels a lot less wonky and crash-prone than its cousins in the Linux photo management game. It grabbed our attention from a Slashdot thread where the F-Spot-to-Shotwell transition was announced and duly critiqued.
gThumb is a free download for Linux systems running GNOME desktops and is available in most major Linux repositories. Ubuntu users, in fact, can install gThumb with one click from the app's home page.