<s>
Black	B-Application
Duck	I-Application
Open	I-Application
Hub	I-Application
,	O
formerly	O
Ohloh	B-Application
,	O
is	O
a	O
website	O
which	O
provides	O
a	O
web	O
services	O
suite	O
and	O
online	B-Architecture
community	I-Architecture
platform	O
that	O
aims	O
to	O
index	O
the	O
open-source	B-Application
software	I-Application
development	I-Application
community	O
.	O
</s>
<s>
,	O
the	O
site	O
lists	O
669,601	O
open-source	O
projects	O
,	O
681,345	O
source	B-Architecture
control	I-Architecture
repositories	O
,	O
3,848,524	O
contributors	O
and	O
31,688,426,179	O
lines	O
of	O
code	O
.	O
</s>
<s>
Ohloh	B-Application
is	O
a	O
website	O
that	O
provides	O
a	O
web	O
services	O
suite	O
and	O
online	B-Architecture
community	I-Architecture
platform	O
that	O
aims	O
to	O
index	O
the	O
open-source	B-Application
software	I-Application
development	I-Application
community	O
.	O
</s>
<s>
,	O
the	O
site	O
lists	O
669,601	O
open-source	O
projects	O
,	O
681,345	O
source	B-Architecture
control	I-Architecture
repositories	O
,	O
3,848,524	O
contributors	O
and	O
31,688,426,179	O
lines	O
of	O
code	O
.	O
</s>
<s>
On	O
28	O
May	O
2009	O
,	O
Ohloh	B-Application
was	O
acquired	O
by	O
Geeknet	O
,	O
owners	O
of	O
the	O
popular	O
open-source	O
development	O
platform	O
SourceForge	B-Application
.	O
</s>
<s>
However	O
,	O
Geeknet	O
sold	O
Ohloh	B-Application
to	O
the	O
open-source	O
analysis	O
company	O
Black	O
Duck	O
Software	O
on	O
5	O
October	O
2010	O
.	O
</s>
<s>
Black	O
Duck	O
integrated	O
Ohloh	B-Application
's	O
functionality	O
with	O
their	O
existing	O
products	O
to	O
advance	O
the	O
site	O
into	O
a	O
major	O
resource	O
for	O
FOSS	B-License
development	O
.	O
</s>
<s>
On	O
18	O
July	O
2014	O
,	O
Ohloh	B-Application
became	O
Black	B-Application
Duck	I-Application
Open	I-Application
Hub	I-Application
.	O
</s>
<s>
In	O
late	O
August	O
2014	O
,	O
the	O
Black	B-Application
Duck	I-Application
Open	I-Application
Hub	I-Application
's	O
Organizations	O
feature	O
moved	O
out	O
of	O
Beta	O
and	O
into	O
Version	O
1.0	O
.	O
</s>
<s>
By	O
retrieving	O
data	O
from	O
revision	B-Architecture
control	I-Architecture
repositories	I-Architecture
(	O
such	O
as	O
CVS	B-Application
,	O
SVN	B-Application
,	O
Git	B-Application
,	O
Bazaar	B-Protocol
,	O
and	O
Mercurial	B-Protocol
)	O
,	O
Black	B-Application
Duck	I-Application
Open	I-Application
Hub	I-Application
provides	O
statistics	O
about	O
the	O
longevity	O
of	O
projects	O
,	O
their	O
licenses	B-Application
(	O
including	O
license	O
conflict	O
information	O
)	O
and	O
software	O
metrics	O
such	O
as	O
source	O
lines	O
of	O
code	O
and	O
commit	B-Language
statistics	O
.	O
</s>
<s>
Software	O
stacks	O
(	O
list	O
of	O
software	O
applications	O
used	O
by	O
Black	B-Application
Duck	I-Application
Open	I-Application
Hub	I-Application
's	O
members	O
)	O
and	O
tags	O
are	O
used	O
to	O
calculate	O
the	O
similarity	O
between	O
projects	O
.	O
</s>
<s>
Those	O
global	O
statistics	O
across	O
all	O
projects	O
in	O
Black	B-Application
Duck	I-Application
Open	I-Application
Hub	I-Application
have	O
also	O
been	O
used	O
to	O
identify	O
those	O
with	O
the	O
most	O
extensive	O
continuous	O
revision	B-Architecture
control	I-Architecture
histories	O
.	O
</s>
<s>
Contributor	O
statistics	O
are	O
also	O
available	O
,	O
measuring	O
open-source	O
developers	O
 '	O
experience	O
as	O
observable	O
in	O
code	O
committed	O
to	O
revision	B-Architecture
control	I-Architecture
repositories	I-Architecture
.	O
</s>
<s>
The	O
idea	O
of	O
measuring	O
open-source	O
developers	O
 '	O
skills	O
and	O
productivity	O
on	O
the	O
basis	O
of	O
commit	B-Language
statistics	O
or	O
mutual	O
rating	O
has	O
received	O
mixed	O
reactions	O
in	O
technology	O
blogs	O
.	O
</s>
<s>
Contributor	O
profiles	O
may	O
also	O
contain	O
a	O
contributor	O
supplied	O
email	O
address	O
,	O
and	O
avatars	O
loaded	O
from	O
Gravatar	B-General_Concept
using	O
that	O
email	O
address	O
.	O
</s>
<s>
On	O
22	O
August	O
2007	O
,	O
a	O
public	O
beta	O
of	O
a	O
web-service	O
API	B-Application
was	O
announced	O
,	O
exposing	O
Black	B-Application
Duck	I-Application
Open	I-Application
Hub	I-Application
's	O
data	O
and	O
reports	O
to	O
promote	O
the	O
development	O
of	O
third-party	O
applications	O
.	O
</s>
<s>
The	O
PAI	O
shows	O
long-term	O
activity	O
and	O
growth	O
on	O
FOSS	B-License
projects	O
,	O
but	O
its	O
requirement	O
that	O
there	O
be	O
at	O
least	O
a	O
year	O
of	O
data	O
means	O
that	O
new	O
projects	O
ca	O
n't	O
be	O
ranked	O
.	O
</s>
<s>
In	O
2012	O
,	O
Black	B-Application
Duck	I-Application
Open	I-Application
Hub	I-Application
launched	O
Open	B-Application
Hub	I-Application
Code	O
Search	O
,	O
a	O
free	O
code	O
search	O
engine	O
based	O
on	O
the	O
predecessor	O
Koders	B-Application
.	O
</s>
