<s>
groff	B-Application
(	O
)	O
(	O
also	O
called	O
GNU	B-Operating_System
troff	B-Application
)	O
is	O
a	O
typesetting	O
system	O
that	O
creates	O
formatted	O
output	O
when	O
given	O
plain	O
text	O
mixed	O
with	O
formatting	O
commands	O
.	O
</s>
<s>
It	O
is	O
the	O
GNU	B-Operating_System
replacement	O
for	O
the	O
troff	B-Application
and	O
nroff	B-Device
text	B-General_Concept
formatters	I-General_Concept
.	O
</s>
<s>
Groff	B-Application
contains	O
a	O
large	O
number	O
of	O
helper	O
programs	O
,	O
preprocessors	B-General_Concept
,	O
and	O
postprocessors	O
including	O
eqn	B-Application
,	O
tbl	B-Application
,	O
pic	B-Language
and	O
soelim	O
.	O
</s>
<s>
There	O
are	O
also	O
several	O
macro	O
packages	O
included	O
that	O
duplicate	O
,	O
expand	O
on	O
the	O
capabilities	O
of	O
,	O
or	O
outright	O
replace	O
the	O
standard	O
troff	B-Application
macro	O
packages	O
.	O
</s>
<s>
Groff	B-Application
development	O
of	O
new	O
features	O
is	O
active	O
,	O
and	O
is	O
an	O
important	O
part	O
of	O
free	O
,	O
open	O
source	O
,	O
and	O
UNIX	B-Application
derived	O
operating	O
systems	O
such	O
as	O
Linux	B-Application
and	O
4.4BSD	O
derivatives	O
notably	O
because	O
troff	B-Application
macros	O
are	O
used	O
to	O
create	O
man	B-Protocol
pages	I-Protocol
,	O
the	O
standard	O
form	O
of	O
documentation	O
on	O
Unix	B-Application
and	O
Unix-like	O
systems	O
.	O
</s>
<s>
OpenBSD	B-Operating_System
has	O
replaced	O
groff	B-Application
with	O
mandoc	B-Application
in	O
the	O
base	O
install	O
,	O
since	O
their	O
4.9	O
release	O
,	O
as	O
has	O
macOS	B-Operating_System
Ventura	I-Operating_System
.	O
</s>
<s>
groff	B-Application
is	O
an	O
original	O
implementation	O
written	O
primarily	O
in	O
C++	B-Language
by	O
James	O
Clark	O
and	O
is	O
modeled	O
after	O
ditroff	B-Application
,	O
including	O
many	O
extensions	O
.	O
</s>
<s>
The	O
first	O
stable	O
version	O
,	O
1.04	O
,	O
was	O
announced	O
in	O
November	O
1991	O
.	O
groff	B-Application
was	O
developed	O
as	O
free	B-Application
software	I-Application
to	O
provide	O
an	O
easily	O
obtained	O
replacement	O
for	O
the	O
standard	O
AT&T	O
troff/nroff	O
package	O
,	O
which	O
at	O
the	O
time	O
was	O
proprietary	O
,	O
and	O
was	O
not	O
always	O
available	O
even	O
on	O
branded	O
UNIX	B-Application
systems	I-Application
.	O
</s>
<s>
In	O
1999	O
,	O
Werner	O
Lemberg	O
and	O
Ted	O
Harding	O
took	O
over	O
maintenance	O
of	O
groff	B-Application
.	O
</s>
<s>
The	O
current	O
version	O
of	O
groff	B-Application
is	O
1.22.4	O
,	O
released	O
on	O
.	O
</s>
