<s>
X	B-Library
Athena	I-Library
Widgets	I-Library
or	O
Xaw	B-Library
is	O
a	O
GUI	B-Application
widget	B-Library
library	I-Library
for	O
the	O
X	B-Operating_System
Window	I-Operating_System
System	I-Operating_System
.	O
</s>
<s>
Developed	O
as	O
part	O
of	O
Project	B-Operating_System
Athena	I-Operating_System
,	O
Xaw	B-Library
was	O
written	O
under	O
the	O
auspices	O
of	O
the	O
MIT	B-License
X	I-License
Consortium	O
as	O
a	O
sample	O
widget	B-Library
set	I-Library
built	O
on	O
X	B-Language
Toolkit	I-Language
Intrinsics	I-Language
(	O
Xt	O
)	O
;	O
Xt	O
and	O
Xaw	B-Library
are	O
collectively	O
known	O
as	O
the	O
X	B-Language
Toolkit	I-Language
.	O
</s>
<s>
Xaw	B-Library
has	O
been	O
largely	O
superseded	O
by	O
more	O
sophisticated	O
toolkits	O
like	O
Motif	B-Application
,	O
and	O
later	O
toolkits	O
such	O
as	O
GTK	B-Application
,	O
and	O
Qt	B-Language
,	O
but	O
it	O
is	O
still	O
maintained	O
(	O
by	O
the	O
X.Org	B-Application
Foundation	I-Application
)	O
and	O
is	O
available	O
as	O
part	O
of	O
most	O
X	B-Operating_System
Window	I-Operating_System
System	I-Operating_System
installations	O
.	O
</s>
<s>
The	O
library	B-Library
,	O
like	O
other	O
core	O
parts	O
of	O
X	B-Operating_System
,	O
is	O
licensed	O
under	O
the	B-License
MIT	I-License
License	I-License
.	O
</s>
<s>
In	O
a	O
talk	O
for	O
USENIX	B-Operating_System
,	O
X	B-Operating_System
pioneer	O
Jim	O
Gettys	O
remarked	O
that	O
although	O
Athena	B-Library
widgets	I-Library
were	O
"	O
ugly	O
"	O
,	O
they	O
were	O
often	O
used	O
in	O
the	O
period	O
of	O
X	B-Operating_System
history	O
that	O
he	O
describes	O
as	O
the	O
"	O
GUI	B-Application
wars	O
"	O
,	O
as	O
a	O
safe	O
alternative	O
to	O
the	O
competing	O
Motif	B-Application
and	O
Open	B-Operating_System
Look	I-Operating_System
toolkits	O
.	O
</s>
