These images came from external sources.

dfeet-method.png, dfeet-object.png, dfeet-property.png:
https://fedorahosted.org/d-feet/

hotwire.png:
FIXME: I believe this was a gtk-connect stock icon from a theme.

hotwire-openssh.png:
FIXME: Somewhere from openssh.org, I think

hotwire-sudo.png:
FIXME: This was originally service.png somewhere

perl.ico:
http://perl.org/favicon.ico

python.ico:
http://python.org/favicon.ico

ruby.ico:
http://ruby-lang.org/favicon.ico

unix.ico:
http://unix.org/favicon.ico

throbber.gif, throbber-done.gif:
FIXME: Some throbbers web page

external.png (GPL):
http://svn.wikimedia.org/svnroot/mediawiki/trunk/phase3/skins/simple/external.png