Blue Mountain
Resident Skeptical Hobbit
For Linux, I've discovered that most of the GUI apps shipped with KDE do the job, but the quality varies from poor (RPM manager) to outstanding (Amarok).
For viewing pictures, the old-as-the-hills (not updated in 10(!) years) 'xv' is still better than Kuickshow; it has better key bindings and more tools.
For file management, nothing beats the Midnight Commander ('mc'). Although there's a GUI version, I still use the terminal/shell version. Lightning fast, and its ability to tag a bunch of files and then use the '%t' macro to insert the names of those tagged files into a command line means you can do some complex stuff with a bunch of files at once rather easily.
And for the system administrator in you, there's lsof (list open files.) Not only can it tell you the name of every file every application currently has open, it can also tell you about IPC controls, shared memory segments, and IP addresses, too. Chances are you got a copy with your Linux distribution.
For viewing pictures, the old-as-the-hills (not updated in 10(!) years) 'xv' is still better than Kuickshow; it has better key bindings and more tools.
For file management, nothing beats the Midnight Commander ('mc'). Although there's a GUI version, I still use the terminal/shell version. Lightning fast, and its ability to tag a bunch of files and then use the '%t' macro to insert the names of those tagged files into a command line means you can do some complex stuff with a bunch of files at once rather easily.
And for the system administrator in you, there's lsof (list open files.) Not only can it tell you the name of every file every application currently has open, it can also tell you about IPC controls, shared memory segments, and IP addresses, too. Chances are you got a copy with your Linux distribution.