<s>
Calibre	B-Operating_System
(	O
,	O
stylised	O
calibre	B-Operating_System
)	O
is	O
a	O
cross-platform	B-Operating_System
free	B-License
and	I-License
open-source	I-License
suite	O
of	O
e-book	O
software	O
.	O
</s>
<s>
Calibre	B-Operating_System
supports	O
organizing	O
existing	O
e-books	O
into	O
virtual	O
libraries	O
,	O
displaying	O
,	O
editing	O
,	O
creating	O
and	O
converting	O
e-books	O
,	O
as	O
well	O
as	O
syncing	O
e-books	O
with	O
a	O
variety	O
of	O
e-readers	O
.	O
</s>
<s>
On	O
31	O
October	O
2006	O
,	O
when	O
Sony	O
introduced	O
its	O
PRS-500	B-Application
e-reader	O
,	O
Kovid	O
Goyal	O
started	O
developing	O
libprs500	O
,	O
aiming	O
mainly	O
to	O
enable	O
use	O
of	O
the	O
PRS-500	B-Application
formats	O
on	O
Linux	B-Application
.	O
</s>
<s>
In	O
2008	O
,	O
the	O
program	O
,	O
for	O
which	O
a	O
graphical	O
user	O
interface	O
was	O
developed	O
,	O
was	O
renamed	O
"	O
calibre	B-Operating_System
"	O
,	O
displayed	O
in	O
all	O
lowercase	O
.	O
</s>
<s>
Calibre	B-Operating_System
supports	O
many	O
file	O
formats	O
and	O
reading	O
devices	O
.	O
</s>
<s>
Calibre	B-Operating_System
does	O
not	O
natively	O
support	O
DRM	O
removal	O
,	O
but	O
may	O
allow	O
DRM	O
removal	O
after	O
installing	O
plug-ins	B-Application
with	O
such	O
a	O
function	O
.	O
</s>
<s>
Calibre	B-Operating_System
allows	O
users	O
to	O
sort	O
and	O
group	O
e-books	O
by	O
metadata	O
fields	O
.	O
</s>
<s>
Metadata	O
can	O
be	O
pulled	O
from	O
many	O
different	O
sources	O
,	O
e.g.	O
,	O
ISBNdb.com	O
;	O
online	O
booksellers	O
;	O
and	O
providers	O
of	O
free	O
e-books	O
and	O
periodicals	O
in	O
the	O
US	O
and	O
elsewhere	O
,	O
such	O
as	O
the	O
Internet	O
Archive	O
,	O
Munsey	O
's	O
Magazine	O
,	O
and	O
Project	O
Gutenberg	O
;	O
and	O
social	O
networking	O
sites	O
for	O
readers	O
,	O
such	O
as	O
Goodreads	B-Application
and	O
LibraryThing	B-Library
.	O
</s>
<s>
It	O
is	O
possible	O
to	O
search	O
the	O
Calibre	B-Operating_System
library	O
by	O
various	O
fields	O
,	O
such	O
as	O
author	O
,	O
title	O
,	O
or	O
keyword	O
;	O
however	O
,	O
full-text	O
search	O
has	O
not	O
yet	O
been	O
implemented	O
.	O
</s>
<s>
E-books	O
can	O
be	O
imported	O
into	O
the	O
Calibre	B-Operating_System
library	O
,	O
either	O
by	O
sideloading	B-Protocol
files	O
manually	O
or	O
by	O
wirelessly	O
syncing	O
an	O
e-book	O
reading	O
device	O
with	O
the	O
cloud	O
storage	O
service	O
in	O
which	O
the	O
Calibre	B-Operating_System
library	O
is	O
backed	O
up	O
,	O
or	O
with	O
the	O
computer	O
on	O
which	O
Calibre	B-Operating_System
resides	O
.	O
</s>
<s>
This	O
conversion	O
is	O
facilitated	O
by	O
so-called	O
recipes	O
,	O
short	O
programs	O
written	O
in	O
a	O
Python-based	O
domain-specific	B-Language
language	I-Language
.	O
</s>
<s>
E-books	O
can	O
then	O
be	O
exported	O
to	O
all	O
supported	O
reading	O
devices	O
via	O
USB	B-Protocol
,	O
Calibre	B-Operating_System
's	O
integrated	O
mail	B-Protocol
server	I-Protocol
,	O
or	O
wirelessly	O
.	O
</s>
<s>
Mailing	O
e-books	O
enables	O
,	O
for	O
example	O
,	O
sending	O
personal	O
documents	O
to	O
the	B-General_Concept
Amazon	I-General_Concept
Kindle	I-General_Concept
family	O
of	O
e-readers	O
and	O
tablet	B-Device
computers	I-Device
.	O
</s>
<s>
Also	O
,	O
if	O
the	O
Calibre	B-Operating_System
library	O
on	O
the	O
host	O
computer	O
is	O
stored	O
in	O
a	O
cloud	O
service	O
,	O
such	O
as	O
Box.net,	O
Google	B-Application
Drive	I-Application
,	O
or	O
Dropbox	B-Application
,	O
then	O
either	O
the	O
cloud	O
service	O
or	O
a	O
third-party	O
app	O
,	O
such	O
as	O
Calibre	B-Operating_System
Cloud	O
or	O
CalibreBox	O
,	O
can	O
remotely	O
access	O
the	O
library	O
.	O
</s>
<s>
Since	O
version	O
1.15	O
,	O
released	O
in	O
December	O
2013	O
,	O
Calibre	B-Operating_System
also	O
contains	O
an	O
application	O
to	O
create	O
and	O
edit	O
e-books	O
directly	O
,	O
similar	O
to	O
the	O
more	O
full-featured	O
editor	O
tools	O
of	O
the	O
Sigil	B-Operating_System
application	O
,	O
but	O
without	O
the	O
latter	O
's	O
WYSIWYG	B-Application
editing	O
mode	O
.	O
</s>
<s>
Calibre	B-Operating_System
Cloud	O
(	O
free	O
)	O
and	O
Calibre	B-Operating_System
Cloud	O
Pro	O
(	O
paid	O
)	O
,	O
apps	O
by	O
Intrepid	O
Logic	O
that	O
let	O
one	O
"	O
access	O
your	O
Calibre	B-Operating_System
e-book	O
library	O
from	O
anywhere	O
in	O
the	O
world	O
.	O
</s>
<s>
Place	O
your	O
calibre	B-Operating_System
library	O
in	O
your	O
Dropbox	B-Application
,	O
Box	O
,	O
or	O
Google	B-Application
Drive	I-Application
folder	O
,	O
and	O
be	O
able	O
to	O
view	O
,	O
search	O
,	O
and	O
download	O
from	O
your	O
library	O
anywhere	O
"	O
.	O
</s>
<s>
As	O
Jane	O
Litte	O
at	O
Dear	O
Author	O
and	O
John	O
Jeremy	O
at	O
Teleread	O
observe	O
:	O
This	O
tool	O
can	O
be	O
used	O
to	O
"	O
create	O
 [ one's ] 	O
own	O
Cloud	O
of	O
eBooks	O
"	O
and	O
thereby	O
read	O
and	O
allow	O
downloads	O
and	O
emails	O
from	O
one	O
's	O
Calibre	B-Operating_System
library	O
via	O
the	O
Calibre	B-Operating_System
folder	O
in	O
Box.net,	O
Dropbox	B-Application
,	O
or	O
Google	B-Application
Drive	I-Application
.	O
</s>
<s>
Because	O
the	O
Calibre-generated	O
local	O
wireless	O
feed	O
(	O
OPDS	O
)	O
can	O
only	O
be	O
accessed	O
on	O
devices	O
sharing	O
the	O
same	O
network	O
as	O
the	O
Calibre	B-Operating_System
library	O
,	O
this	O
feature	O
of	O
the	O
Calibre	B-Operating_System
Cloud	O
apps	O
is	O
particularly	O
useful	O
when	O
away	O
from	O
one	O
's	O
home	O
network	O
,	O
because	O
it	O
allows	O
one	O
to	O
download	O
and	O
read	O
the	O
contents	O
of	O
one	O
's	O
Calibre	B-Operating_System
library	O
via	O
the	O
Calibre	B-Operating_System
folder	O
in	O
Box	O
,	O
Dropbox	B-Application
,	O
or	O
Google	B-Application
Drive	I-Application
.	O
</s>
<s>
Calibre	B-Operating_System
Companion	O
(	O
paid	O
)	O
,	O
an	O
app	O
by	O
MultiPie	O
,	O
Ltd.	O
,	O
recommended	O
by	O
calibre	B-Operating_System
's	O
developers	O
,	O
"	O
brings	O
complete	O
integration	O
with	O
calibre	B-Operating_System
on	O
your	O
desktop	O
,	O
giving	O
you	O
total	O
control	O
over	O
book	O
management	O
on	O
your	O
device.	O
"	O
</s>
<s>
John	O
Jermey	O
at	O
Teleread	O
notes	O
this	O
app	O
can	O
manage	O
Calibre/device	O
libraries	O
as	O
if	O
one	O
's	O
mobile	O
device	O
were	O
plugged	O
into	O
computer	O
;	O
however	O
,	O
unlike	O
Calibre	B-Operating_System
Cloud	O
,	O
Calibre	B-Operating_System
Companion	O
requires	O
users	O
to	O
be	O
at	O
a	O
computer	O
and	O
use	O
the	O
Calibre-generated	O
local	O
wireless	O
feed	O
(	O
OPDS	O
)	O
.	O
</s>
<s>
Calibre	B-Operating_System
Library	O
(	O
paid	O
)	O
,	O
an	O
app	O
by	O
Tony	O
Maro	O
that	O
allows	O
one	O
to	O
"	O
Connect	O
wirelessly	O
to	O
your	O
Calibre	B-Operating_System
e-book	O
library	O
or	O
other	O
Stanza	O
source	O
.	O
</s>
<s>
This	O
app	O
's	O
operations	O
and	O
benefits	O
are	O
similar	O
to	O
those	O
offered	O
by	O
Calibre	B-Operating_System
Cloud	O
.	O
</s>
<s>
Calibre	B-Operating_System
Sync	O
(	O
free	O
)	O
,	O
an	O
app	O
by	O
Seng	O
Jea	O
Lee	O
that	O
"	O
seamlessly	O
connects	O
to	O
your	O
Calibre	B-Operating_System
Library	O
and	O
shows	O
up	O
as	O
a	O
connected	O
device	O
on	O
Calibre	B-Operating_System
.	O
</s>
<s>
If	O
Auto-Connect	O
option	O
is	O
enabled	O
,	O
your	O
device	O
will	O
attempt	O
to	O
connect	O
to	O
the	O
Calibre	B-Operating_System
Library	O
when	O
it	O
is	O
within	O
the	O
home	O
Wi-Fi	O
network	O
.	O
</s>
<s>
This	O
allows	O
Calibre	B-Operating_System
to	O
automatically	O
update	O
your	O
device	O
with	O
the	O
latest	O
newspaper	O
or	O
magazines	O
you	O
have	O
scheduled	O
for	O
download	O
!	O
"	O
</s>
<s>
As	O
with	O
Calibre	B-Operating_System
Companion	O
,	O
this	O
app	O
requires	O
the	O
device	O
to	O
be	O
on	O
the	O
same	O
network	O
as	O
the	O
Calibre	B-Operating_System
library	O
.	O
</s>
<s>
CalibreBox	O
(	O
free	O
and	O
paid	O
)	O
,	O
an	O
app	O
by	O
Eric	O
Hoffmann	O
that	O
,	O
like	O
Calibre	B-Operating_System
Cloud	O
,	O
accesses	O
Calibre	B-Operating_System
libraries	O
from	O
cloud	O
storage	O
.	O
</s>
<s>
Unlike	O
Calibre	B-Operating_System
Cloud	O
,	O
it	O
is	O
limited	O
to	O
Dropbox	B-Application
,	O
but	O
CalibreBox	O
supports	O
more	O
than	O
one	O
library	O
at	O
a	O
time	O
,	O
and	O
flexible	O
sorting	O
and	O
filtering	O
.	O
</s>
<s>
The	O
app	O
is	O
built	O
on	O
the	O
design	O
principles	O
of	O
Google	O
's	O
Material	B-Application
Design	I-Application
and	O
is	O
under	O
active	O
development	O
.	O
</s>
<s>
Calibre-go	O
(	O
free	O
)	O
,	O
app	O
by	O
Litlcode	O
Studios	O
lets	O
you	O
access	O
your	O
Calibre	B-Operating_System
e-book	O
library	O
from	O
cloud	O
storage	O
and	O
access	O
the	O
library	O
through	O
Calibre-go	O
to	O
browse	O
,	O
sort	O
,	O
search	O
and	O
read	O
books	O
on	O
your	O
mobile	O
.	O
</s>
<s>
Calibre-go	O
supports	O
multiple	O
libraries	O
across	O
multiple	O
accounts	O
simultaneously	O
.	O
</s>
<s>
Calibre	B-Operating_System
Sync	O
(	O
paid	O
)	O
,	O
an	O
Android	O
app	O
by	O
BIL	O
Studio	O
that	O
lets	O
you	O
access	O
Calibre	B-Operating_System
libraries	O
from	O
cloud	O
storage	O
(	O
Dropbox	B-Application
,	O
OneDrive	B-Application
,	O
Box	O
,	O
and	O
pCloud	O
)	O
,	O
or	O
from	O
SD	O
card	O
.	O
</s>
<s>
Calibre	B-Operating_System
Sync	O
supports	O
multiple	O
libraries	O
across	O
multiple	O
accounts	O
simultaneously	O
,	O
also	O
allows	O
users	O
to	O
browse	O
,	O
sort	O
,	O
search	O
,	O
filter	O
and	O
download	O
books	O
to	O
read	O
on	O
devices	O
.	O
</s>
