<s>
PlanetLab	B-Application
was	O
a	O
group	O
of	O
computers	O
available	O
as	O
a	O
testbed	O
for	O
computer	B-Architecture
networking	I-Architecture
and	O
distributed	B-Architecture
systems	I-Architecture
research	O
.	O
</s>
<s>
Each	O
research	O
project	O
had	O
a	O
"	O
slice	O
"	O
,	O
or	O
virtual	B-Architecture
machine	I-Architecture
access	O
to	O
a	O
subset	O
of	O
the	O
nodes	O
.	O
</s>
<s>
Accounts	O
were	O
limited	O
to	O
persons	O
affiliated	O
with	O
corporations	O
and	O
universities	O
that	O
hosted	O
PlanetLab	B-Application
nodes	O
.	O
</s>
<s>
However	O
,	O
a	O
number	O
of	O
free	O
,	O
public	O
services	O
have	O
been	O
deployed	O
on	O
PlanetLab	B-Application
,	O
including	O
CoDeeN	B-Application
,	O
the	O
Coral	O
Content	O
Distribution	O
Network	O
,	O
and	O
Open	O
DHT	O
.	O
</s>
<s>
PlanetLab	B-Application
was	O
officially	O
shut	O
down	O
in	O
May	O
2020	O
but	O
continues	O
in	O
Europe	O
.	O
</s>
