Thunderbird : mail client

Firefox : web browser

Pidgin (formerly Gaim)

Httrack

Xmms : equivalent of winamp (out of portage now, xmms2 soon)

Audacious : another equivalent of winamp

mplayer

VLC

Gimp : equivalent of PaintShop

KolourPaint : equivalent of Windows Paint

geekie : a nice image viewer (fork of gqview)

Inkscape : vectorial picture editors

Dia : to do vectorial schemes

motion : video motion detector for your webcam

AviDemux : encoder

Hugin : create panoramic images

Gobby : a collaborative editor

Scite : equivalent of Notepad++

Kate : another sort of equivalent of Notepad++

nano : a light console text editor

flpsed : a PDF pseudo-editor (to fill form when there is no true form)

Fluxbox : a light and highly configurable window manager !

mrxvt : a nice tabbed console

wcalc : a very strong command line calculator

Stardict : dictionary

acroread : Acrobat Reader

Evince : a very light and fast pdf, ps and dvi viewer

Xfe : a file explorer

Krusader : a complete file commander

Conky : a nice system monitor

xosd : to print text on the screen with shortcuts

x11vnc : a VNC server implementation which acts like under Windows

tightvnc : a good VNC client

screen : enables to detach a ssh session (to let it running while closing the ssh connection)

scilab : equivalent of matlab

gnuplot : to easily draw plots

Doxygen : to automatically generate documentation

Valgrind : memory checker for c++

cccc : compute some criteria for your code

SlocSount : counts number of lines of your code

Umbrello : UML

gdb : GNU debugger

htop : CPU and MEM usage

jnettop : Network usage

rlocate : implementation of locate which also indexes in-line

Wine : to run Windows executables

VirtualBox : PC emulator to run Windows or Linux

Celestia :

Stellarium :

KStars :