What is your killer Linux app/ app you simply can't be without in Windows or OS X?

[Dml]

A counterpart to windows app thread [sorry if it been posted before]:
what Linux applications or features would prevent you from ever switching back to Windows or OS X?

For me its shell and generally, posix environment, as well as ease of setting up build environments, especially cross platform.
On OS X I have posix environment but miss gnome terminal a LOT (dunno if it has been ported though).
I use mostly open source applications (OpenOffice, Gimp, Inkscape, etc), and those seem to work better on Linux as well.
And what I miss the most on non-free systems is package manager.

[Dimitriid]

Package Managers.

[Viva]

I don't think I can use windows anymore. I haven't logged in for a few months.

[szymon_g]

1. virtual desktops - like in gnome/kde/icewm (basically, in every wm) - i definetly cannot live without them!
2. package management - i dont have to remember and to check websites of various programs in search for updates.

[heroidi]

k3b amarok rythmbox package manager and the beloved TERMINAL :P

[RaZe42]

Package Management
Multiple desktops
Gnome-Do's Docky
Compiz
A desktop menu
Possibility to have a panel-less setup
And, in a lesser degree:
Banshee
Inkscape (yes, there's a Windows version, but gtk apps in Windows somehow just don't cut it)

[unknownPoster]

1. virtual desktops - like in gnome/kde/icewm (basically, in every wm) - i definetly cannot live without them!


I definitely agree. Virtual desktops increase my efficiency while working quite substantially.

[cb951303]

gnome-do
banshee
lottanzb

+1 for virtual desktops and package managers

[which ones pink]

Just to point out a few things:
Windows has a terminal, though it's pretty useless. OS X too, but it has bash.
Gnome-Do is inspired by Quicksilver, which is native to Mac.
IMO, there's no media player that can compare to Winamp 5.x (Windows only), unless you want uber-lightweight.
OS X Leopard has virtual desktops.

The package manager and Compiz are probably the most awesome features of Linux (and the best ways to show it off) aside from under-the-hood stuff. And the pretty much infinite customization.

[Tibuda]

Package manager
Compiz
QuodLibet
Gnome Do
Tomboy
Terminal tools (grep, sed...)

[Barrucadu]

Package management, tiling window managers, MPD/ncmpcpp, and the GNU userspace.

[lethalfang]

the ease of setting up SSH server