GtkPod
Gtkpod is the software developed in Gtk+ for ipod linux.
Gtkpod supports adding removing playlists and recreating iTunes DB.

For more details:
Gtkpod Website

XBGM for xbox
This is one the xbox game manager which extracts files
from xbox isos and sends to xbox
This is written in GTK#.
works on linux,win32 and Mac platforms.

For more details:
XBGM# for xbox

Gtk Popstation
For all Sony PSP users
use this software

For more details:
Gtk popstation

GnuBoy Emulator for nintendo gameboy
GnuboyGX is the emulator for nintendo gameboy

for more details: