<s>
The	O
ONOS	B-Application
(	O
Open	B-Application
Network	I-Application
Operating	I-Application
System	I-Application
)	O
project	O
is	O
an	O
open	B-License
source	I-License
community	O
hosted	O
by	O
The	B-Operating_System
Linux	I-Operating_System
Foundation	I-Operating_System
.	O
</s>
<s>
On	O
December	O
5	O
,	O
2014	O
,	O
the	O
Open	O
Networking	O
Lab	O
(	O
ON.Lab	O
)	O
along	O
with	O
other	O
industry	O
partners	O
including	O
AT&T	O
and	O
NTT	O
Communications	O
released	O
the	O
ONOS	B-Application
source	O
code	O
to	O
start	O
the	O
open	B-License
source	I-License
community	O
.	O
</s>
<s>
On	O
October	O
14	O
,	O
2015	O
,	O
the	B-Operating_System
Linux	I-Operating_System
Foundation	I-Operating_System
announced	O
that	O
ONOS	B-Application
had	O
joined	O
the	O
organization	O
as	O
one	O
of	O
its	O
collaborative	O
projects	O
.	O
</s>
<s>
The	O
name	O
ONOS	B-Application
was	O
coined	O
around	O
end	O
of	O
2012	O
by	O
Berde	O
.	O
</s>
<s>
The	O
software	O
is	O
written	O
in	O
Java	O
and	O
provides	O
a	O
distributed	O
SDN	O
applications	O
platform	O
atop	O
Apache	O
Karaf	O
OSGi	B-Application
container	O
.	O
</s>
<s>
While	O
ONOS	B-Application
leans	O
heavily	O
on	O
standard	O
protocols	O
and	O
models	O
,	O
e.g.	O
</s>
<s>
Instead	O
,	O
ONOS	B-Application
provides	O
its	O
own	O
set	O
of	O
high-level	O
abstractions	O
and	O
models	O
,	O
which	O
it	O
exposes	O
to	O
the	O
application	O
programmers	O
.	O
</s>
<s>
ONOS	B-Application
application	O
management	O
subsystem	O
assumes	O
the	O
responsibility	O
for	O
distributing	O
the	O
application	O
artifacts	O
throughout	O
the	O
cluster	O
to	O
assure	O
that	O
all	O
nodes	O
are	O
running	O
the	O
same	O
application	O
software	O
.	O
</s>
<s>
ONOS	B-Application
base	O
distribution	O
contains	O
over	O
175	O
applications	O
,	O
which	O
fall	O
into	O
numerous	O
categories	O
,	O
e.g.	O
</s>
<s>
gRPC	O
interfaces	O
for	O
ONOS	B-Application
are	O
under	O
active	O
development	O
.	O
</s>
<s>
The	O
ONOS	B-Application
software	O
has	O
been	O
used	O
as	O
a	O
platform	O
that	O
applications	O
have	O
been	O
written	O
on	O
top	O
of	O
or	O
has	O
been	O
integrated	O
into	O
other	O
projects	O
.	O
</s>
<s>
The	O
following	O
lists	O
the	O
different	O
ONOS	B-Application
releases	O
that	O
are	O
all	O
named	O
after	O
different	O
types	O
of	O
birds	O
in	O
alphabetical	O
order	O
:	O
</s>
<s>
There	O
are	O
two	O
tiers	O
of	O
membership	O
for	O
ONOS	B-Application
:	O
Partner	O
and	O
Collaborator	O
,	O
with	O
varying	O
levels	O
of	O
commitment	O
.	O
</s>
