Picasa is a free software download from Google. Now available for Linux!
So, how does it work? Picasa for Linux runs the current Windows version of Picasa using a carefully tested version of Wine, an open-source implementation of the Windows application-programming interface (API). Wine runs on top of the X Window System and Linux or Unix. But it’s not a Windows emulator; instead, it provides a Windows API middleware layer that enables Windows programs to run on Linux without the slowing effects of OS emulation or a virtual machine.