<s>
efax	B-Device
is	O
an	O
integrated	O
fax	O
program	O
for	O
Unix-like	B-Operating_System
computer	O
systems	O
,	O
produced	O
by	O
Casas	O
Communications	O
Engineering	O
since	O
1993	O
.	O
</s>
<s>
It	O
is	O
command-line	B-Application
based	O
,	O
but	O
there	O
are	O
several	O
graphical	B-Application
user	I-Application
interfaces	I-Application
available	O
.	O
</s>
<s>
efax	B-Device
is	O
open-source	B-Application
and	O
free	B-Application
software	I-Application
,	O
licensed	O
under	O
the	O
GPL	B-License
.	O
</s>
<s>
It	O
is	O
included	O
in	O
several	O
major	O
Linux	B-Application
distributions	I-Application
,	O
including	O
Debian	O
,	O
Red	O
Hat	O
,	O
Mandriva	O
,	O
and	O
others	O
.	O
</s>
<s>
There	O
is	O
also	O
a	O
BSD	B-Operating_System
version	O
,	O
and	O
it	O
forms	O
part	O
of	O
the	O
Apple	B-Operating_System
Mac	I-Operating_System
OS	I-Operating_System
X	I-Operating_System
Darwin	B-Operating_System
system	O
.	O
</s>
