<s>
This	O
is	O
a	O
list	O
of	O
free	O
information	B-Library
retrieval	I-Library
libraries	B-Library
,	O
which	O
are	O
libraries	B-Library
used	O
in	O
software	O
development	O
for	O
performing	O
it	B-Library
retrieval	I-Library
functions	O
.	O
</s>
<s>
It	O
is	O
not	O
a	O
complete	O
list	O
of	O
such	O
libraries	B-Library
,	O
but	O
is	O
instead	O
a	O
list	O
of	O
free	O
information	B-Library
retrieval	I-Library
libraries	B-Library
with	O
articles	O
on	O
Wikipedia	O
.	O
</s>
<s>
It	O
does	O
not	O
include	O
commercial	O
software	B-Library
libraries	I-Library
.	O
</s>
