<s>
NATS	O
is	O
an	O
open-source	B-Application
messaging	O
system	O
(	O
sometimes	O
called	O
message-oriented	B-Application
middleware	I-Application
)	O
.	O
</s>
<s>
The	O
NATS	O
server	O
is	O
written	O
in	O
the	O
Go	B-Application
programming	I-Application
language	I-Application
.	O
</s>
<s>
NATS	O
was	O
originally	O
developed	O
by	O
as	O
the	O
messaging	O
control	O
plane	O
for	O
Cloud	B-General_Concept
Foundry	I-General_Concept
and	O
was	O
written	O
in	O
Ruby	B-Language
.	O
</s>
<s>
NATS	O
was	O
later	O
ported	O
to	O
Go	B-Application
.	O
</s>
<s>
The	O
source	O
code	O
is	O
released	O
under	O
the	O
Apache	B-Application
2.0	I-Application
License	I-Application
.	O
</s>
<s>
A	O
-	O
a	O
pluggable	O
Java	B-Language
based	O
framework	O
to	O
connect	O
NATS	O
and	O
other	O
services	O
.	O
</s>
<s>
NATS	O
is	O
a	O
CNCF	B-Application
project	O
with	O
Kubernetes	B-General_Concept
and	O
Prometheus	B-Language
(	O
software	O
)	O
integration	O
.	O
</s>
