<s>
Etherpad	B-Language
(	O
previously	O
known	O
as	O
EtherPad	B-Language
)	O
is	O
an	O
open-source	B-Application
,	O
web-based	B-Application
collaborative	B-Application
real-time	I-Application
editor	I-Application
,	O
allowing	O
authors	O
to	O
simultaneously	O
edit	O
a	O
text	O
document	O
,	O
and	O
see	O
all	O
of	O
the	O
participants	O
 '	O
edits	O
in	O
real-time	O
,	O
with	O
the	O
ability	O
to	O
display	O
each	O
author	O
's	O
text	O
in	O
their	O
own	O
color	O
.	O
</s>
<s>
First	O
launched	O
in	O
November	O
2008	O
,	O
the	O
software	O
was	O
acquired	O
by	O
Google	B-Application
in	O
December	O
2009	O
,	O
and	O
released	O
as	O
open	O
source	O
later	O
that	O
month	O
.	O
</s>
<s>
Further	O
development	O
is	O
coordinated	O
by	O
the	O
Etherpad	B-Language
Foundation	O
.	O
</s>
<s>
Merging	O
of	O
changes	O
is	O
handled	O
by	O
operational	B-Operating_System
transform	I-Operating_System
.	O
</s>
<s>
The	O
document	O
can	O
be	O
downloaded	O
in	O
plain	O
text	O
,	O
HTML	B-Language
,	O
Open	B-Application
Document	I-Application
,	O
Microsoft	B-Application
Word	I-Application
,	O
or	O
PDF	B-Application
format	I-Application
.	O
</s>
<s>
Automated	O
markup	O
of	O
JavaScript	B-Language
code	O
was	O
made	O
available	O
shortly	O
after	O
the	O
launch	O
.	O
</s>
<s>
Etherpad	B-Language
itself	O
is	O
implemented	O
in	O
JavaScript	B-Language
,	O
on	O
top	O
of	O
the	O
AppJet	B-Application
platform	O
,	O
with	O
the	O
real-time	O
functionality	O
achieved	O
through	O
Comet	B-General_Concept
streaming	O
.	O
</s>
<s>
At	O
the	O
time	O
of	O
its	O
launch	O
,	O
Etherpad	B-Language
was	O
the	O
first	O
web	B-Application
application	I-Application
of	O
its	O
kind	O
to	O
achieve	O
true	O
real-time	O
performance	O
,	O
a	O
feat	O
previously	O
only	O
achieved	O
by	O
desktop	O
applications	O
such	O
as	O
SubEthaEdit	B-Operating_System
(	O
for	O
Mac	B-Device
)	O
,	O
Gobby	O
,	O
or	O
MoonEdit	B-Application
(	O
both	O
cross-platform	B-Operating_System
)	O
.	O
</s>
<s>
The	O
client-side	O
text	O
editor	O
in	O
Etherpad	B-Language
and	O
its	O
Etherpad	B-Language
Lite	O
fork	O
is	O
implemented	O
using	O
Appjet	B-Application
's	O
in-browser	O
text	O
editor	O
,	O
written	O
in	O
JavaScript	B-Language
.	O
</s>
<s>
Etherpad	B-Language
was	O
launched	O
on	O
November	O
19	O
,	O
2008	O
by	O
David	O
Greenspan	O
,	O
Aaron	O
Iba	O
,	O
and	O
J.D.	O
</s>
<s>
Zamfirescu	O
(	O
the	O
latter	O
two	O
being	O
former	O
Google	B-Application
employees	O
)	O
.	O
</s>
<s>
They	O
were	O
later	O
joined	O
by	O
former	O
Googler	B-Application
Daniel	O
Clemens	O
and	O
designer	O
David	O
Cole	O
.	O
</s>
<s>
The	O
original	O
website	O
was	O
etherpad.com	O
.	O
</s>
<s>
Etherpad	B-Language
was	O
covered	O
by	O
Slashdot	O
on	O
November	O
21	O
,	O
2008	O
,	O
resulting	O
in	O
server	B-General_Concept
slowdown	I-General_Concept
and	I-General_Concept
downtime	I-General_Concept
.	O
</s>
<s>
When	O
Google	B-Application
Wave	I-Application
was	O
announced	O
,	O
the	O
Etherpad	B-Language
team	O
wrote	O
on	O
their	O
blog	O
comparing	O
the	O
two	O
platforms	O
and	O
stating	O
that	O
the	O
minimalist	O
and	O
targeted	O
Etherpad	B-Language
interface	O
could	O
be	O
an	O
advantage	O
in	O
some	O
use	B-Architecture
cases	I-Architecture
.	O
</s>
<s>
Still	O
,	O
on	O
4	O
December	O
2009	O
,	O
Etherpad	B-Language
announced	O
on	O
its	O
blog	O
that	O
it	O
had	O
been	O
acquired	O
by	O
Google	B-Application
for	O
integration	O
into	O
Google	B-Application
Wave	I-Application
.	O
</s>
<s>
Existing	O
Etherpad	B-Language
users	O
would	O
receive	O
invites	O
for	O
Google	B-Application
Wave	I-Application
.	O
</s>
<s>
On	O
31	O
March	O
2010	O
,	O
Etherpad	B-Language
announced	O
that	O
creation	O
of	O
new	O
pads	O
would	O
be	O
allowed	O
until	O
April	O
14	O
(	O
pad	O
creation	O
was	O
still	O
allowed	O
as	O
of	O
April	O
18	O
,	O
though	O
)	O
and	O
existing	O
pads	O
could	O
still	O
be	O
accessed	O
and	O
used	O
until	O
May	O
14	O
.	O
</s>
<s>
The	O
Etherpad	B-Language
service	O
terminated	O
on	O
May	O
14	O
.	O
</s>
<s>
Google	B-Application
released	O
the	O
source	O
code	O
for	O
Etherpad	B-Language
under	O
the	O
Apache	B-Application
License	I-Application
version	O
2.0	O
on	O
December	O
17	O
,	O
2009	O
.	O
</s>
<s>
Subsequently	O
,	O
Google	B-Application
asked	O
the	O
Etherpad	B-Language
code	O
maintainers	O
to	O
remove	O
JSMin	O
from	O
its	O
code	O
tree	O
due	O
to	O
a	O
clause	O
in	O
its	O
license	O
stating	O
,	O
"	O
The	O
Software	O
shall	O
be	O
used	O
for	O
Good	O
,	O
not	O
Evil	O
,	O
"	O
which	O
is	O
not	O
compatible	O
with	O
the	O
open	O
source	O
licenses	O
allowed	O
on	O
Google	B-Protocol
Code	I-Protocol
.	O
</s>
<s>
After	O
the	O
release	O
of	O
the	O
software	O
as	O
open	O
source	O
,	O
a	O
number	O
of	O
people	O
have	O
set	O
up	O
Etherpad	B-Language
servers	O
,	O
as	O
clones	O
of	O
the	O
original	O
website	O
.	O
</s>
<s>
Soon	O
after	O
,	O
users	O
and	O
programmers	O
of	O
Etherpad	B-Language
,	O
after	O
an	O
initial	O
meeting	O
,	O
created	O
the	O
Etherpad	B-Language
Foundation	O
to	O
coordinate	O
further	O
development	O
.	O
</s>
<s>
Their	O
website	O
maintains	O
a	O
list	O
of	O
a	O
growing	O
number	O
of	O
sites	O
that	O
run	O
the	O
Etherpad	B-Language
software	O
.	O
</s>
<s>
Etherpad	B-Language
Lite	O
is	O
an	O
almost	O
complete	O
rewrite	O
of	O
the	O
original	O
Etherpad	B-Language
software	O
,	O
based	O
on	O
different	O
technical	O
foundations	O
and	O
written	O
by	O
different	O
authors	O
.	O
</s>
<s>
While	O
the	O
original	O
Etherpad	B-Language
is	O
written	O
in	O
Java	B-Language
and	O
Scala	B-Application
and	O
has	O
quite	O
demanding	O
system	O
requirements	O
,	O
Etherpad	B-Language
Lite	O
is	O
written	O
in	O
server-side	O
JavaScript	B-Language
using	O
Node.js	B-Language
.	O
</s>
<s>
Etherpad	B-Language
Lite	O
has	O
some	O
distinctive	O
features	O
which	O
are	O
not	O
available	O
in	O
the	O
original	O
version	O
:	O
</s>
<s>
Clients	O
for	O
PHP	B-Application
,	O
Python	B-Language
,	O
Ruby	B-Language
,	O
JavaScript	B-Language
,	O
Java	B-Language
,	O
Objective-C	B-Language
and	O
Perl	B-Language
which	O
interface	O
with	O
the	O
API	B-Application
.	O
</s>
<s>
More	O
than	O
50	O
plugins	O
,	O
among	O
them	O
email_notifications	O
,	O
invite_via_email	O
,	O
offline_edit	O
,	O
fileupload	O
,	O
tables	O
or	O
rtc	O
for	O
video	O
calls	O
based	O
on	O
WebRTC	B-Protocol
.	O
</s>
<s>
EtherpadLite	O
offers	O
a	O
number	O
of	O
export	O
formats	O
,	O
including	O
LaTeX	B-Application
,	O
but	O
,	O
not	O
Markdown	O
.	O
</s>
<s>
Localization	B-General_Concept
is	O
achieved	O
collaboratively	O
through	O
translatewiki.net	B-Language
.	O
</s>
