<s>
Kallithea	B-Application
is	O
a	O
cross-platform	B-Operating_System
free	B-Application
software	I-Application
source	B-Architecture
code	I-Architecture
management	I-Architecture
system	O
,	O
the	O
primary	O
goal	O
of	O
which	O
is	O
to	O
provide	O
a	O
repository	O
hosting	O
service	O
with	O
features	O
for	O
collaboration	O
,	O
such	O
as	O
forking	B-Application
,	O
pull	O
requests	O
,	O
code	O
review	O
,	O
issue	B-Application
tracking	I-Application
etc	O
.	O
</s>
<s>
Kallithea	B-Application
is	O
a	O
fork	B-Application
of	O
RhodeCode	B-Protocol
,	O
created	O
after	O
the	O
original	O
developer	O
had	O
changed	O
the	O
license	O
terms	O
.	O
</s>
<s>
While	O
earlier	O
versions	O
of	O
RhodeCode	B-Protocol
were	O
licensed	O
entirely	O
under	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
version	O
3	O
,	O
RhodeCode	B-Protocol
version	O
2.0	O
(	O
released	O
in	O
August	O
2013	O
)	O
introduced	O
exceptions	O
for	O
parts	O
of	O
the	O
software	O
distribution	O
.	O
</s>
<s>
Kallithea	B-Application
is	O
mostly	O
written	O
in	O
Python	B-Language
.	O
</s>
<s>
Kallithea	B-Application
is	O
a	O
member	O
project	O
of	O
Software	O
Freedom	O
Conservancy	O
.	O
</s>
<s>
Kallithea	B-Application
supports	O
hosting	O
repositories	O
of	O
Mercurial	B-Protocol
and	O
Git	B-Application
version	I-Application
control	I-Application
systems	I-Application
.	O
</s>
<s>
Its	O
web	O
interface	O
for	O
projects	O
allows	O
to	O
fork	B-Application
as	O
well	O
as	O
management	O
of	O
pull	O
requests	O
.	O
</s>
<s>
It	O
can	O
also	O
be	O
used	O
to	O
quickly	O
exchange	O
code	B-Application
snippets	I-Application
by	O
means	O
of	O
a	O
revision	O
controlled	O
pastebin	O
(	O
"	O
gists	O
"	O
)	O
.	O
</s>
