<s>
Sinatra	B-Application
is	O
a	O
free	B-Application
and	I-Application
open	I-Application
source	I-Application
software	I-Application
web	B-Application
application	I-Application
library	O
and	O
domain-specific	B-Language
language	I-Language
written	O
in	O
Ruby	B-Language
.	O
</s>
<s>
It	O
is	O
an	O
alternative	O
to	O
other	O
Ruby	B-Language
web	B-Application
application	I-Application
frameworks	I-Application
such	O
as	O
Ruby	B-Application
on	I-Application
Rails	I-Application
,	O
Merb	B-Application
,	O
Nitro	O
,	O
and	O
Camping	B-Application
.	O
</s>
<s>
It	O
is	O
dependent	O
on	O
the	O
Rack	B-Application
web	O
server	O
interface	O
.	O
</s>
<s>
It	O
is	O
named	O
after	O
musician	O
Frank	O
Sinatra	B-Application
.	O
</s>
<s>
Designed	O
and	O
developed	O
by	O
Blake	O
Mizerany	O
,	O
Sinatra	B-Application
is	O
small	O
and	O
flexible	O
.	O
</s>
<s>
It	O
does	O
not	O
follow	O
the	O
typical	O
model	O
–	O
view	O
–	O
controller	O
pattern	O
used	O
in	O
other	O
frameworks	O
,	O
such	O
as	O
Ruby	B-Application
on	I-Application
Rails	I-Application
.	O
</s>
<s>
Instead	O
,	O
Sinatra	B-Application
focuses	O
on	O
"	O
quickly	O
creating	O
web-applications	B-Application
in	O
Ruby	B-Language
with	O
minimal	O
effort.	O
"	O
</s>
<s>
Because	O
of	O
much	O
smaller	O
size	O
compared	O
to	O
Ruby	B-Application
on	I-Application
Rails	I-Application
,	O
it	O
is	O
also	O
called	O
microframework	O
.	O
</s>
<s>
Some	O
notable	O
companies	O
and	O
institutions	O
that	O
use	O
Sinatra	B-Application
include	O
Apple	O
,	O
BBC	O
,	O
the	O
British	O
Government	O
's	O
Government	O
Digital	O
Service	O
,	O
LinkedIn	B-Application
,	O
the	O
National	O
Security	O
Agency	O
,	O
Engine	O
Yard	O
,	O
Heroku	B-General_Concept
,	O
GitHub	B-Application
,	O
Stripe	B-Application
,	O
and	O
Songbird	B-Application
.	O
</s>
<s>
Travis	B-Application
CI	I-Application
provides	O
much	O
of	O
the	O
financial	O
support	O
for	O
Sinatra	B-Application
's	O
development	O
.	O
</s>
<s>
Sinatra	B-Application
was	O
created	O
and	O
open-sourced	O
in	O
2007	O
.	O
</s>
<s>
It	O
inspired	O
multiple	O
ports	O
and	O
similar	O
projects	O
in	O
other	O
programming	O
languages	O
,	O
such	O
as	O
Express.js	B-Language
and	O
Scalatra	B-Language
.	O
</s>
<s>
Mizerany	O
and	O
Heroku	B-General_Concept
's	O
Adam	O
Wiggins	O
introduced	O
and	O
discussed	O
Sinatra	B-Application
at	O
RubyConf	B-Language
2008	O
.	O
</s>
