A MUST
Openbox - http://icculus.org/openbox/
rox-filer - http://rox.sourceforge.net/desktop/static.html
VNC Viewer - ?
nmap - http://insecure.org/nmap/
PuTTY - http://www.chiark.greenend.org.uk/~sgtatham/putty/
Dillo - http://www.dillo.org/
FileZilla - http://filezilla.sourceforge.net/
XChat -  http://www.xchat.org/
Ophcrack -  http://ophcrack.sourceforge.net/


MAYBE
SLiM - http://slim.berlios.de/
Firefox - http://www.mozilla.com/en-US/