bash (I could use (z,c)sh if forced at gunpoint, but I have too many personal scripts relying on bashisms), byobu/screen, rxvt, openssh-client, git, vim, irssi, chrome, empathy, dropbox.

There was a time when I would've listed mutt, procmail and getmail at the front of a list like this, but mutt doesn't seem to play well with flaky connections, and with desert island broadband being what it is...