efax-gtk is a GTK+ front end for the efax program. It can
be used to send and receive faxes with a fax modem, and to
view, print and manage faxes received.

It also has a socket interface to provide a "virtual
printer" for sending faxes from word processors and
similar programs, and can automatically e-mail a received
fax to a designated user, and automatically print a
received fax.