<s>
Hackpad	B-Application
was	O
a	O
web-based	B-Application
collaborative	B-Application
real-time	I-Application
text	I-Application
editor	I-Application
forked	O
from	O
Etherpad	B-Language
.	O
</s>
<s>
It	O
was	O
used	O
as	O
the	O
company	O
wikis	B-Protocol
by	O
multiple	O
prominent	O
startups	O
of	O
the	O
2010s	O
,	O
such	O
as	O
Airbnb	O
,	O
Stripe	B-Application
,	O
and	O
Upworthy	O
.	O
</s>
<s>
In	O
April	O
2014	O
,	O
Hackpad	B-Application
was	O
acquired	O
by	O
Dropbox	B-Application
.	O
</s>
<s>
In	O
April	O
2015	O
,	O
it	O
was	O
announced	O
that	O
Hackpad	B-Application
would	O
be	O
released	O
as	O
open	O
source	O
and	O
source	O
code	O
was	O
published	O
on	O
GitHub	O
in	O
August	O
2015	O
,	O
under	O
the	O
Apache	B-Application
license	I-Application
2.0	O
.	O
</s>
<s>
On	O
April	O
25	O
,	O
2017	O
,	O
Hackpad	B-Application
announced	O
that	O
it	O
is	O
to	O
shut	O
down	O
on	O
July	O
19	O
,	O
2017	O
,	O
permanently	O
migrating	O
to	O
Dropbox	B-Application
Paper	I-Application
.	O
</s>
