<s>
An	O
outliner	B-Application
(	O
or	O
outline	B-Application
processor	I-Application
)	O
is	O
a	O
specialized	O
type	O
of	O
text	B-Application
editor	I-Application
(	O
word	B-General_Concept
processor	I-General_Concept
)	O
used	O
to	O
create	O
and	O
edit	O
outlines	O
,	O
which	O
are	O
text	B-General_Concept
files	I-General_Concept
which	O
have	O
a	O
tree	B-Data_Structure
structure	I-Data_Structure
,	O
for	O
organization	O
.	O
</s>
<s>
When	O
loaded	O
into	O
an	O
outliner	B-Application
,	O
an	O
outline	O
may	O
be	O
collapsed	B-Application
or	I-Application
expanded	I-Application
to	O
display	O
as	O
few	O
or	O
as	O
many	O
levels	O
as	O
desired	O
.	O
</s>
<s>
Outliners	B-Application
are	O
used	O
for	O
storing	O
and	O
retrieving	O
textual	O
information	O
,	O
with	O
terms	O
,	O
phrases	O
,	O
sentences	O
,	O
or	O
paragraphs	O
attached	O
to	O
a	O
tree	O
.	O
</s>
<s>
An	O
outline	O
in	O
an	O
outliner	B-Application
may	O
contain	O
as	O
many	O
topics	O
as	O
desired	O
.	O
</s>
<s>
The	O
main	O
difference	O
between	O
a	O
hand-written	O
outline	O
and	O
a	O
digital	O
one	O
is	O
that	O
the	O
former	O
is	O
usually	O
limited	O
to	O
a	O
summary	O
or	O
blueprint	O
of	O
a	O
planned	O
document	O
,	O
while	O
the	O
latter	O
may	O
easily	O
include	O
all	O
of	O
the	O
content	O
of	O
the	O
entire	O
document	O
and	O
many	O
more	B-Application
.	O
</s>
<s>
Outliners	B-Application
may	O
be	O
used	O
in	O
content	O
creation	O
instead	O
of	O
general	O
word	B-General_Concept
processors	I-General_Concept
for	O
capturing	O
,	O
organizing	O
,	O
editing	O
,	O
and	O
displaying	O
knowledge	O
or	O
general	O
textual	O
information	O
.	O
</s>
<s>
Outliners	B-Application
are	O
ideal	O
for	O
managing	O
lists	O
,	O
organizing	O
facts	O
and	O
ideas	O
,	O
and	O
for	O
writing	B-Data_Structure
computer	I-Data_Structure
programs	I-Data_Structure
.	O
</s>
<s>
They	O
are	O
also	O
used	O
for	O
goal	O
and	O
task	O
management	O
(	O
including	O
personal	B-Application
information	I-Application
management	I-Application
and	O
project	O
management	O
)	O
,	O
and	O
for	O
writing	O
books	O
and	O
movie	O
scripts	O
.	O
</s>
<s>
An	O
alternative	O
to	O
outliners	B-Application
are	O
mind	B-Protocol
mappers	I-Protocol
,	O
which	O
display	O
a	O
tree	B-Data_Structure
structure	I-Data_Structure
as	O
a	O
node	O
–	O
link	O
diagram	O
.	O
</s>
<s>
The	O
principal	O
attribute	O
of	O
outline	B-Application
editors	I-Application
is	O
that	O
they	O
support	O
or	O
enforce	O
the	O
use	O
of	O
a	O
hierarchy	O
of	O
their	O
items	O
.	O
</s>
<s>
Some	O
outliners	B-Application
also	O
allow	O
the	O
user	O
to	O
create	O
custom	O
fields	O
and/or	O
filter	O
on	O
fields	O
.	O
</s>
<s>
There	O
are	O
two	O
basic	O
types	O
of	O
outliners	B-Application
:	O
one-pane	O
or	O
intrinsic	O
,	O
and	O
two-pane	O
or	O
extrinsic	O
,	O
each	O
with	O
its	O
strengths	O
and	O
weaknesses	O
.	O
</s>
<s>
A	O
one-pane	O
outliner	B-Application
is	O
known	O
as	O
an	O
intrinsic	O
outliner	B-Application
because	O
the	O
text	O
itself	O
is	O
organized	O
into	O
an	O
outline	O
formatindividual	O
sections	O
(	O
such	O
as	O
paragraphs	O
)	O
of	O
text	O
can	O
be	O
collapsed	B-Application
or	I-Application
expanded	I-Application
,	O
while	O
keeping	O
others	O
in	O
view	O
.	O
</s>
<s>
One	O
of	O
the	O
strengths	O
of	O
one-pane	O
outliners	B-Application
is	O
that	O
,	O
because	O
the	O
text	O
itself	O
is	O
what	O
is	O
structured	O
and	O
because	O
several	O
nodes	O
of	O
text	O
are	O
visible	O
at	O
once	O
,	O
it	O
is	O
easy	O
to	O
edit	O
across	O
sections	O
.	O
</s>
<s>
The	O
drawback	O
is	O
that	O
,	O
because	O
the	O
structure	O
is	O
not	O
always	O
visible	O
,	O
there	O
is	O
not	O
as	O
strong	O
an	O
overview	O
of	O
the	O
whole	O
or	O
ability	O
to	O
quickly	O
navigate	O
between	O
sections	O
as	O
with	O
a	O
two-pane	O
outliner	B-Application
.	O
</s>
<s>
Some	O
word	B-General_Concept
processors	I-General_Concept
,	O
such	O
as	O
Microsoft	O
Word	O
,	O
have	O
an	O
Outline	O
Mode	O
to	O
help	O
with	O
structuring	O
documents	O
.	O
</s>
<s>
A	O
two-pane	O
outliner	B-Application
separates	O
structure	O
from	O
contentthe	O
structure	O
is	O
extrinsic	O
to	O
the	O
text	O
.	O
</s>
<s>
A	O
tree	B-Data_Structure
structure	I-Data_Structure
with	O
node	O
titles	O
is	O
presented	O
in	O
one	O
pane	O
,	O
and	O
the	O
text	O
is	O
shown	O
in	O
another	O
.	O
</s>
<s>
The	O
drawback	O
is	O
that	O
since	O
only	O
one	O
node	O
's	O
worth	O
of	O
text	O
is	O
shown	O
at	O
one	O
time	O
and	O
navigation	O
has	O
the	O
additional	O
step	O
of	O
crossing	O
panes	O
,	O
the	O
structure	O
is	O
more	B-Application
rigid	O
,	O
making	O
editing	O
across	O
nodes	O
more	B-Application
difficult	O
.	O
</s>
<s>
This	O
view	O
is	O
similar	O
to	O
many	O
file	O
browsers	O
and	O
email	O
programs	O
(	O
which	O
can	O
be	O
thought	O
of	O
as	O
three-pane	O
outliners	B-Application
)	O
.	O
</s>
<s>
A	O
one	O
-	O
and	O
two-pane	O
outliner	B-Application
may	O
be	O
combined	O
as	O
a	O
hybrid	O
.	O
</s>
<s>
One	O
additional	O
advantage	O
of	O
hybrid	O
is	O
that	O
single	O
pane	O
can	O
be	O
used	O
as	O
single	O
pane	O
outliner	B-Application
with	O
second	O
pane	O
used	O
for	O
notes	O
or	O
reference	O
tracking	O
.	O
</s>
<s>
A	O
third	O
approach	O
to	O
intrinsic	O
outlines	O
is	O
the	O
multi-column	O
outliner	B-Application
.	O
</s>
<s>
It	O
is	O
similar	O
to	O
the	O
one-pane	O
outliner	B-Application
in	O
that	O
the	O
text	O
itself	O
is	O
organized	O
into	O
an	O
outline	O
format	O
.	O
</s>
<s>
CHM	B-Protocol
-	O
standard	O
Windows	O
format	O
for	O
help	O
,	O
books	O
,	O
etc	O
.	O
</s>
<s>
Name	O
Operating	O
system	O
Notes	O
AllMyNotes	B-Application
Organizer	I-Application
Windows	O
Can	O
password-protect	O
file	O
access	O
,	O
supports	O
skins	B-Application
.	O
</s>
<s>
Bike	O
Outliner	B-Application
MacOS	O
Notable	O
for	O
fluid	O
animations	O
and	O
good	O
performance	O
on	O
large	O
files	O
.	O
</s>
<s>
Ecco	B-Application
Pro	I-Application
Windows	O
Freeware	O
outliner	B-Application
.	O
</s>
<s>
Freeplane	B-Language
cross-platform	O
(	O
Java	B-Language
)	O
Mind	B-Protocol
mapper	I-Protocol
and	O
outliner	B-Application
with	O
comments	O
and	O
graphical	O
connections	O
(	O
links	O
)	O
GrandView	B-Application
MS-DOS	B-Application
Single-pane	O
outliner	B-Application
dating	O
from	O
the	O
1980s	O
.	O
</s>
<s>
KAMAS	B-Application
CP/M	B-Application
,	O
later	O
MS-DOS	B-Application
(	O
Knowledge	O
and	O
Mind	O
Amplification	O
System	O
)	O
Not	O
as	O
successful	O
for	O
MS-DOS	B-Application
as	O
it	O
had	O
been	O
for	O
CP/M	B-Application
.	O
</s>
<s>
KeyNote	B-Application
NF	I-Application
(	O
formerly	O
Keynote	B-Application
)	O
Windows	O
Mozilla	B-License
Public	I-License
License	I-License
.	O
</s>
<s>
KJots	O
Linux	O
Leo	B-Language
Windows/Linux/MacOS	O
Text	B-Application
editor	I-Application
with	O
outlines	O
;	O
remarkably	O
flexible	O
tree	B-Data_Structure
structure	I-Data_Structure
.	O
</s>
<s>
Written	O
in	O
Python	B-Language
using	O
Qt	B-Language
.	O
</s>
<s>
MORE	B-Application
Mac	O
OS	O
7/8/9	O
Classic	O
Mac	O
outliner	B-Application
from	O
the	O
late	O
1980s	O
&	O
early	O
1990s	O
MyInfo	B-Language
Windows	O
Two-pane	O
,	O
but	O
can	O
emulate	O
basic	O
one-pane	O
outliner	B-Application
as	O
well	O
.	O
</s>
<s>
OmniOutliner	B-Operating_System
Mac	O
OS	O
X	O
Single/double	O
pane	O
outliner	B-Application
with	O
columns	O
and	O
extensive	O
customization	O
capabilities	O
.	O
</s>
<s>
OrgMode	B-Operating_System
cross-platform	O
Emacs	B-Application
outlining	O
mode	O
Scrivener	B-Application
Mac	O
OS	O
&	O
Windows	O
;	O
Linux	O
beta	O
Flexible	O
content	O
generator	O
for	O
writers	O
;	O
powerful	O
multipane	O
outliner	B-Application
TheBrain	B-Protocol
Windows	O
,	O
Mac	O
,	O
iOS	O
,	O
Android	O
Free	O
form	O
graphical	O
outliner	B-Application
Treeline	B-Application
outlinerWindows/Linux	O
Free	O
3-pane	O
outliner	B-Application
;	O
2nd	O
pane	O
shows	O
details	O
of	O
highlighted	O
node	O
,	O
3rd	O
pane	O
lists	O
details	O
of	O
its	O
children	O
.	O
</s>
<s>
This	O
table	O
shows	O
a	O
list	O
of	O
notable	O
browser-based	O
outliners	B-Application
categorised	O
by	O
the	O
functionality	O
that	O
they	O
provide	O
(	O
see	O
'	O
Design	O
 '	O
above	O
)	O
.	O
</s>
<s>
Browser-based	O
outliners	B-Application
run	O
inside	O
a	O
desktop	O
or	O
mobile	O
web	O
browser	O
(	O
smart	O
phone	O
or	O
tablet	O
)	O
and	O
may	O
synchronise	O
the	O
outline	O
's	O
data	O
with	O
a	O
remote	O
server	O
or	O
store	O
it	O
locally	O
on	O
the	O
user	O
's	O
device	O
.	O
</s>
