Hello,
Here's my list and please edit it to suit your preferences and add
more categories:
3D animation [ blender ]
audio editor [ audacity ]
audio player [ xmms ]
cd-ripper [ sound-juicer ]
dbms [ postgresql ]
document viewer [ dpkg-www ]
disc burner [ k3b, gnomebaker ]
e-mail client [ (none) - I use Gmail ]
file manager [ nautilus ]
finance [ gnucash ]
image editor [ gimp ]
image viewer [ gthumb ]
mathematics [ octave ]
misc utilities [ lsof, sloccount, splint, sudo, top, uptimed ]
package manager [ aptitude ]
tag editor [ juk ]
terminal emulator [ gnome-terminal ]
text editor [ gedit, nano ]
(unreleased) [ GNU HURD ]
video player [ xine-ui ]
web browser [ mozilla-firefox ]