<s>
Blacklight	B-Application
is	O
an	O
open-source	O
Ruby	B-Application
on	I-Application
Rails	I-Application
engine	O
for	O
creating	O
search	O
interfaces	O
on	O
top	O
of	O
Apache	B-Language
Solr	I-Language
indices	O
.	O
</s>
<s>
The	O
software	O
is	O
used	O
by	O
libraries	O
to	O
create	O
discovery	B-Library
layers	I-Library
or	O
institutional	O
repositories	O
;	O
by	O
museums	O
and	O
archives	O
to	O
highlight	O
digital	O
collections	O
;	O
and	O
by	O
other	O
information	B-Library
retrieval	I-Library
projects	O
.	O
</s>
<s>
The	O
University	O
of	O
Virginia	O
began	O
developing	O
Blacklight	B-Application
based	O
on	O
its	O
Collex	O
scholarly	O
publishing	O
software	O
,	O
which	O
also	O
used	O
Ruby	B-Language
and	O
Rails	O
and	O
Solr	B-Language
.	O
</s>
<s>
Blacklight	B-Application
includes	O
support	O
faceted	O
browsing	O
,	O
relevance-based	O
searching	O
,	O
bookmarking	O
documents	O
,	O
permanent	O
URLs	O
for	O
documents	O
.	O
</s>
<s>
It	O
is	O
relatively	O
simple	O
to	O
customize	O
Blacklight	B-Application
,	O
typically	O
by	O
writing	O
Ruby	B-Language
code	O
that	O
overrides	O
default	O
Blacklight	B-Application
code	O
.	O
</s>
<s>
There	O
are	O
several	O
plugins	O
available	O
for	O
Blacklight	B-Application
as	O
well	O
,	O
including	O
an	O
extension	O
for	O
geospatial	B-General_Concept
data	I-General_Concept
,	O
a	O
digital	O
exhibit	O
creation	O
tool	O
,	O
and	O
various	O
search	O
and	O
user	O
interface	O
features	O
.	O
</s>
<s>
Early	O
adopters	O
of	O
Blacklight	B-Application
include	O
libraries	O
at	O
University	O
of	O
Virginia	O
,	O
Stanford	O
University	O
,	O
North	O
Carolina	O
State	O
University	O
,	O
WGBH	O
Open	O
Vault	O
,	O
and	O
University	O
of	O
Wisconsin	O
–	O
Madison	O
.	O
</s>
<s>
The	O
National	O
Radio	O
Astronomy	O
Observatory	O
uses	O
Blacklight	B-Application
to	O
provide	O
access	O
to	O
data	O
about	O
telescopes	O
,	O
papers	O
,	O
conference	O
proceedings	O
,	O
and	O
theses	O
.	O
</s>
<s>
The	O
International	O
Consortium	O
of	O
Investigative	O
Journalists	O
used	O
Blacklight	B-Application
with	O
Apache	B-Language
Tika	I-Language
to	O
comb	O
through	O
the	O
11.5	O
million	O
documents	O
from	O
Mossack	O
Fonseca	O
popularly	O
known	O
as	O
the	O
Panama	O
Papers	O
.	O
</s>
