<s>
LaTeX	B-Application
(	O
or	O
,	O
often	O
stylized	O
as	O
)	O
is	O
a	O
software	O
system	O
for	O
document	B-General_Concept
preparation	I-General_Concept
.	O
</s>
<s>
When	O
writing	O
,	O
the	O
writer	O
uses	O
plain	O
text	O
as	O
opposed	O
to	O
the	O
formatted	O
text	O
found	O
in	O
WYSIWYG	B-Application
word	B-General_Concept
processors	I-General_Concept
like	O
Microsoft	B-Application
Word	I-Application
,	O
LibreOffice	B-Protocol
Writer	I-Protocol
and	O
Apple	B-Application
Pages	I-Application
.	O
</s>
<s>
A	O
TeX	B-Application
distribution	O
such	O
as	O
TeX	B-General_Concept
Live	I-General_Concept
or	O
MiKTeX	B-General_Concept
is	O
used	O
to	O
produce	O
an	O
output	O
file	O
(	O
such	O
as	O
PDF	B-Application
or	O
DVI	B-Application
)	O
suitable	O
for	O
printing	O
or	O
digital	O
distribution	O
.	O
</s>
<s>
LaTeX	B-Application
is	O
widely	O
used	O
in	O
academia	O
for	O
the	O
communication	O
and	O
publication	O
of	O
scientific	O
documents	O
in	O
many	O
fields	O
,	O
including	O
mathematics	O
,	O
computer	O
science	O
,	O
engineering	O
,	O
physics	O
,	O
chemistry	O
,	O
economics	O
,	O
linguistics	O
,	O
quantitative	O
psychology	O
,	O
philosophy	O
,	O
and	O
political	O
science	O
.	O
</s>
<s>
LaTeX	B-Application
uses	O
the	O
TeX	B-Application
typesetting	O
program	O
for	O
formatting	O
its	O
output	O
,	O
and	O
is	O
itself	O
written	O
in	O
the	O
TeX	B-Application
macro	I-Application
language	O
.	O
</s>
<s>
LaTeX	B-Application
can	O
be	O
used	O
as	O
a	O
standalone	O
document	B-General_Concept
preparation	I-General_Concept
system	O
,	O
or	O
as	O
an	O
intermediate	O
format	O
.	O
</s>
<s>
In	O
the	O
latter	O
role	O
,	O
for	O
example	O
,	O
it	O
is	O
sometimes	O
used	O
as	O
part	O
of	O
a	O
pipeline	O
for	O
translating	O
DocBook	B-Protocol
and	O
other	O
XML-based	O
formats	O
to	O
PDF	B-Application
.	O
</s>
<s>
Like	O
TeX	B-Application
,	O
LaTeX	B-Application
started	O
as	O
a	O
writing	O
tool	O
for	O
mathematicians	O
and	O
computer	O
scientists	O
,	O
but	O
even	O
from	O
early	O
in	O
its	O
development	O
,	O
it	O
has	O
also	O
been	O
taken	O
up	O
by	O
scholars	O
who	O
needed	O
to	O
write	O
documents	O
that	O
include	O
complex	O
math	O
expressions	O
or	O
non-Latin	O
scripts	O
,	O
such	O
as	O
Arabic	O
,	O
Devanagari	O
and	O
Chinese	O
.	O
</s>
<s>
LaTeX	B-Application
is	O
intended	O
to	O
provide	O
a	O
high-level	O
,	O
descriptive	O
markup	O
language	O
that	O
accesses	O
the	O
power	O
of	O
TeX	B-Application
in	O
an	O
easier	O
way	O
for	O
writers	O
.	O
</s>
<s>
In	O
essence	O
,	O
TeX	B-Application
handles	O
the	O
layout	O
side	O
,	O
while	O
LaTeX	B-Application
handles	O
the	O
content	O
side	O
for	O
document	O
processing	O
.	O
</s>
<s>
LaTeX	B-Application
comprises	O
a	O
collection	O
of	O
TeX	B-Application
macros	I-Application
and	O
a	O
program	O
to	O
process	O
LaTeX	B-Application
documents	O
,	O
and	O
because	O
the	O
plain	B-Application
TeX	I-Application
formatting	O
commands	O
are	O
elementary	O
,	O
it	O
provides	O
authors	O
with	O
ready-made	O
commands	O
for	O
formatting	O
and	O
layout	O
requirements	O
such	O
as	O
chapter	O
headings	O
,	O
footnotes	O
,	O
cross-references	O
and	O
bibliographies	O
.	O
</s>
<s>
LaTeX	B-Application
was	O
originally	O
written	O
in	O
the	O
early	O
1980s	O
by	O
Leslie	O
Lamport	O
at	O
SRI	O
International	O
.	O
</s>
<s>
LaTeX3	B-Application
(	O
)	O
has	O
been	O
under	O
long-term	O
development	O
since	O
the	O
early	O
1990s	O
.	O
</s>
<s>
LaTeX	B-Application
is	O
free	B-Application
software	I-Application
and	O
is	O
distributed	O
under	O
the	O
LaTeX	B-Application
Project	I-Application
Public	I-Application
License	I-Application
(	O
LPPL	B-Application
)	O
.	O
</s>
<s>
LaTeX	B-Application
was	O
created	O
in	O
the	O
early	O
1980s	O
by	O
Leslie	O
Lamport	O
,	O
when	O
he	O
was	O
working	O
at	O
SRI	O
.	O
</s>
<s>
He	O
needed	O
to	O
write	O
TeX	B-Application
macros	I-Application
for	O
his	O
own	O
use	O
,	O
and	O
thought	O
that	O
with	O
a	O
little	O
extra	O
effort	O
he	O
could	O
make	O
a	O
general	O
package	O
usable	O
by	O
others	O
.	O
</s>
<s>
Peter	O
Gordon	O
,	O
an	O
editor	O
at	O
Addison-Wesley	O
,	O
convinced	O
him	O
to	O
write	O
a	O
LaTeX	B-Application
user	O
's	O
manual	O
for	O
publication	O
(	O
Lamport	O
was	O
initially	O
skeptical	O
that	O
anyone	O
would	O
pay	O
money	O
for	O
it	O
)	O
;	O
it	O
came	O
out	O
in	O
1986	O
and	O
sold	O
hundreds	O
of	O
thousands	O
of	O
copies	O
.	O
</s>
<s>
Meanwhile	O
,	O
Lamport	O
released	O
versions	O
of	O
his	O
LaTeX	B-Application
macros	O
in	O
1984	O
and	O
1985	O
.	O
</s>
<s>
On	O
21	O
August	O
1989	O
,	O
at	O
a	O
TeX	B-Application
Users	O
Group	O
(	O
TUG	O
)	O
meeting	O
at	O
Stanford	O
,	O
Lamport	O
agreed	O
to	O
turn	O
over	O
maintenance	O
and	O
development	O
of	O
LaTeX	B-Application
to	O
Frank	O
Mittelbach	O
.	O
</s>
<s>
Mittelbach	O
,	O
along	O
with	O
Chris	O
Rowley	O
and	O
Rainer	O
Schöpf	O
,	O
formed	O
the	O
LaTeX3	B-Application
team	O
;	O
in	O
1994	O
,	O
they	O
released	O
LaTeX2e	O
,	O
the	O
current	O
standard	O
version	O
.	O
</s>
<s>
LaTeX3	B-Application
has	O
since	O
been	O
cancelled	O
with	O
features	O
intended	O
for	O
that	O
version	O
being	O
back-ported	O
to	O
LaTeX2e	O
since	O
2018	O
.	O
</s>
<s>
LaTeX	B-Application
attempts	O
to	O
follow	O
the	O
design	O
philosophy	O
of	O
separating	O
presentation	O
from	O
content	O
,	O
so	O
that	O
authors	O
can	O
focus	O
on	O
the	O
content	O
of	O
what	O
they	O
are	O
writing	O
without	O
attending	O
simultaneously	O
to	O
its	O
visual	O
appearance	O
.	O
</s>
<s>
In	O
preparing	O
a	O
LaTeX	B-Application
document	O
,	O
the	O
author	O
specifies	O
the	O
logical	O
structure	O
using	O
simple	O
,	O
familiar	O
concepts	O
such	O
as	O
chapter	O
,	O
section	O
,	O
table	O
,	O
figure	O
,	O
etc.	O
,	O
and	O
lets	O
the	O
LaTeX	B-Application
system	O
handle	O
the	O
formatting	O
and	O
layout	O
of	O
these	O
structures	O
.	O
</s>
<s>
This	O
concept	O
is	O
similar	O
to	O
the	O
mechanism	O
by	O
which	O
many	O
word	B-General_Concept
processors	I-General_Concept
allow	O
styles	O
to	O
be	O
defined	O
globally	O
for	O
an	O
entire	O
document	O
,	O
or	O
the	O
use	O
of	O
Cascading	B-Language
Style	I-Language
Sheets	I-Language
in	O
styling	O
HTML	B-Language
documents	I-Language
.	O
</s>
<s>
The	O
LaTeX	B-Application
system	O
is	O
a	O
markup	O
language	O
that	O
handles	O
typesetting	O
and	O
rendering	O
,	O
and	O
can	O
be	O
arbitrarily	O
extended	O
by	O
using	O
the	O
underlying	O
macro	O
language	O
to	O
develop	O
custom	O
macros	O
such	O
as	O
new	O
environments	O
and	O
commands	O
.	O
</s>
<s>
Such	O
macros	O
are	O
often	O
collected	O
into	O
packages	O
,	O
which	O
could	O
then	O
be	O
made	O
available	O
to	O
address	O
some	O
specific	O
typesetting	O
needs	O
such	O
as	O
the	O
formatting	O
of	O
complex	O
mathematical	O
expressions	O
or	O
graphics	O
(	O
e.g.	O
,	O
the	O
use	O
of	O
the	O
align	O
environment	O
provided	O
by	O
the	O
amsmath	B-General_Concept
package	O
to	O
produce	O
aligned	O
equations	O
)	O
.	O
</s>
<s>
In	O
order	O
to	O
create	O
a	O
document	O
in	O
LaTeX	B-Application
,	O
you	O
first	O
write	O
a	O
file	O
,	O
say	O
document.tex	O
,	O
using	O
your	O
preferred	O
text	B-Application
editor	I-Application
.	O
</s>
<s>
Then	O
you	O
give	O
your	O
document.tex	O
file	O
as	O
input	O
to	O
the	O
TeX	B-Application
program	O
(	O
with	O
the	O
LaTeX	B-Application
macros	O
loaded	O
)	O
,	O
which	O
prompts	O
TeX	B-Application
to	O
write	O
out	O
a	O
file	O
suitable	O
for	O
onscreen	O
viewing	O
or	O
printing	O
.	O
</s>
<s>
This	O
write-format-preview	O
cycle	O
is	O
one	O
of	O
the	O
chief	O
ways	O
in	O
which	O
working	O
with	O
LaTeX	B-Application
differs	O
from	O
the	O
What-You-See-Is-What-You-Get	B-Application
(	O
WYSIWYG	B-Application
)	O
style	O
of	O
document	O
editing	O
.	O
</s>
<s>
Today	O
,	O
many	O
LaTeX-aware	O
editing	O
programs	O
make	O
this	O
cycle	O
a	O
simple	O
matter	O
through	O
the	O
pressing	O
of	O
a	O
single	O
key	O
,	O
while	O
showing	O
the	O
output	O
preview	O
on	O
the	O
screen	O
beside	O
the	O
input	O
window	O
.	O
</s>
<s>
Some	O
online	O
LaTeX	B-Application
editors	O
even	O
automatically	O
refresh	O
the	O
preview	O
,	O
while	O
other	O
online	O
tools	O
provide	O
incremental	O
editing	O
in-place	O
,	O
mixed	O
in	O
with	O
the	O
preview	O
in	O
a	O
streamlined	O
single	O
window	O
.	O
</s>
<s>
The	O
example	O
below	O
shows	O
the	O
input	O
to	O
LaTeX	B-Application
and	O
the	O
corresponding	O
output	O
from	O
the	O
system	O
:	O
</s>
<s>
the	O
\TeX{}	O
typesetting	O
program	O
.	O
</s>
<s>
\TeX	O
;	O
few	O
people	O
write	O
in	O
plain	O
\TeX{}	O
anymore	O
.	O
</s>
<s>
%	O
The	O
following	O
shows	O
typesetting	O
power	O
of	O
LaTeX	B-Application
:	O
</s>
<s>
The	O
characters	O
'	O
T	O
 '	O
,	O
'	O
E	O
 '	O
,	O
and	O
'	O
X	O
 '	O
in	O
the	O
name	O
come	O
from	O
the	O
Greek	O
capital	O
letters	O
tau	O
,	O
epsilon	B-Language
,	O
and	O
chi	O
,	O
as	O
the	O
name	O
of	O
TeX	B-Application
derives	O
from	O
the	O
( 	O
 '	O
skill	O
 '	O
,	O
'	O
art	O
 '	O
,	O
'	O
technique	O
 '	O
)	O
;	O
for	O
this	O
reason	O
,	O
TeX	B-Application
's	O
creator	O
Donald	O
Knuth	O
promotes	O
its	O
pronunciation	O
as	O
(	O
)	O
(	O
that	O
is	O
,	O
with	O
a	O
voiceless	O
velar	O
fricative	O
as	O
in	O
Modern	O
Greek	O
,	O
similar	O
to	O
the	O
ch	O
in	O
loch	O
)	O
.	O
</s>
<s>
Lamport	O
remarks	O
that	O
"	O
TeX	B-Application
is	O
usually	O
pronounced	O
tech	O
,	O
making	O
lah-tech	O
,	O
lah-tech	O
,	O
and	O
lay-tech	O
the	O
logical	O
choices	O
;	O
but	O
language	O
is	O
not	O
always	O
logical	O
,	O
so	O
lay-tecks	O
is	O
also	O
possible.	O
"	O
</s>
<s>
The	O
name	O
is	O
printed	O
in	O
running	O
text	O
with	O
a	O
typographical	O
logo	B-Device
:	O
.	O
</s>
<s>
In	O
media	O
where	O
the	O
logo	B-Device
cannot	O
be	O
precisely	O
reproduced	O
in	O
running	O
text	O
,	O
the	O
word	O
is	O
typically	O
given	O
the	O
unique	O
capitalization	O
LaTeX	B-Application
.	O
</s>
<s>
Alternatively	O
,	O
the	O
TeX	B-Application
,	O
LaTeX	B-Application
and	O
XeTeX	B-Application
logos	B-Device
can	O
also	O
be	O
rendered	O
via	O
pure	O
CSS	B-Language
and	O
XHTML	B-Language
for	O
use	O
in	O
graphical	O
web	B-Application
browsers	I-Application
—	O
by	O
following	O
the	O
specifications	O
of	O
the	O
internal	O
\LaTeX	O
macro	O
.	O
</s>
<s>
As	O
a	O
macro	O
package	O
,	O
LaTeX	B-Application
provides	O
a	O
set	O
of	O
macros	O
for	O
TeX	B-Application
to	O
interpret	O
.	O
</s>
<s>
There	O
are	O
many	O
other	O
macro	O
packages	O
for	O
TeX	B-Application
,	O
including	O
Plain	B-Application
TeX	I-Application
,	O
GNU	B-Application
Texinfo	I-Application
,	O
AMSTeX	B-General_Concept
,	O
and	O
ConTeXt	O
.	O
</s>
<s>
When	O
TeX	B-Application
"	O
compiles	O
"	O
a	O
document	O
,	O
it	O
follows	O
(	O
from	O
the	O
user	O
's	O
point	O
of	O
view	O
)	O
the	O
following	O
processing	O
sequence	O
:	O
Macros	O
→	O
TeX	B-Application
→	O
Driver	O
→	O
Output	O
.	O
</s>
<s>
Different	O
implementations	O
of	O
each	O
of	O
these	O
steps	O
are	O
typically	O
available	O
in	O
TeX	B-Application
distributions	O
.	O
</s>
<s>
Traditional	O
TeX	B-Application
will	O
output	O
a	O
DVI	B-Application
file	O
,	O
which	O
is	O
usually	O
converted	O
to	O
a	O
PostScript	B-Language
file	O
.	O
</s>
<s>
2000	O
,	O
Hàn	B-Language
Thế	I-Language
Thành	I-Language
and	O
others	O
have	O
written	O
a	O
new	O
implementation	O
of	O
TeX	B-Application
called	O
pdfTeX	B-Language
,	O
which	O
also	O
outputs	O
to	O
PDF	B-Application
and	O
takes	O
advantage	O
of	O
features	O
available	O
in	O
that	O
format	O
.	O
</s>
<s>
The	O
XeTeX	B-Application
engine	O
developed	O
by	O
Jonathan	O
Kew	O
,	O
on	O
the	O
other	O
hand	O
,	O
merges	O
modern	O
font	O
technologies	O
and	O
Unicode	O
with	O
TeX	B-Application
.	O
</s>
<s>
The	O
default	O
font	O
for	O
LaTeX	B-Application
is	O
Knuth	O
's	O
Computer	O
Modern	O
,	O
which	O
gives	O
default	O
documents	O
created	O
with	O
LaTeX	B-Application
the	O
same	O
distinctive	O
look	O
as	O
those	O
created	O
with	O
plain	B-Application
TeX	I-Application
.	O
</s>
<s>
XeTeX	B-Application
allows	O
the	O
use	O
of	O
OpenType	O
and	O
TrueType	O
(	O
that	O
is	O
,	O
outlined	O
)	O
fonts	O
for	O
output	O
files	O
.	O
</s>
<s>
There	O
are	O
also	O
many	O
editors	O
for	O
LaTeX	B-Application
,	O
some	O
of	O
which	O
are	O
offline	O
,	O
source-code-based	O
while	O
others	O
are	O
online	O
,	O
partial-WYSIWYG-based	O
.	O
</s>
<s>
For	O
more	O
,	O
see	O
Comparison	O
of	O
TeX	B-Application
editors	O
.	O
</s>
<s>
LaTeX	B-Application
documents	O
( *	O
.tex	B-Application
)	O
can	O
be	O
opened	O
with	O
any	O
text	B-Application
editor	I-Application
.	O
</s>
<s>
Additionally	O
,	O
TeX	B-Application
documents	O
can	O
be	O
shared	O
by	O
rendering	O
the	O
LaTeX	B-Application
file	O
to	O
Rich	O
Text	O
Format	O
( *	O
.rtf	O
)	O
,	O
XML	B-Protocol
,	O
or	O
the	O
container	O
format	O
.	O
</s>
<s>
This	O
can	O
be	O
done	O
using	O
the	O
free	B-Application
software	I-Application
programs	O
LaTeX2RTF	O
or	O
TeX4ht	B-Protocol
.	O
</s>
<s>
LaTeX	B-Application
can	O
also	O
be	O
rendered	O
to	O
PDF	B-Application
files	I-Application
using	O
the	O
LaTeX	B-Application
extension	O
pdfLaTeX	B-Language
.	O
</s>
<s>
LaTeX	B-Application
files	O
containing	O
Unicode	O
text	O
can	O
be	O
processed	O
into	O
PDFs	B-Application
with	O
the	O
inputenc	O
package	O
,	O
or	O
by	O
the	O
TeX	B-Application
extensions	O
XeLaTeX	B-Application
and	O
LuaLaTeX	O
.	O
</s>
<s>
HeVeA	O
is	O
a	O
converter	O
written	O
in	O
Ocaml	B-Language
that	O
converts	O
LaTeX	B-Application
documents	O
to	O
HTML5	B-Application
.	O
</s>
<s>
It	O
is	O
licensed	O
under	O
the	O
Q	B-Language
Public	I-Language
License	I-Language
.	O
</s>
<s>
LaTeX2HTML	O
is	O
a	O
converter	O
written	O
in	O
Perl	B-Language
that	O
converts	O
LaTeX	B-Application
documents	O
to	O
HTML	B-Language
.	O
</s>
<s>
It	O
is	O
licensed	O
under	O
GNU	B-License
GPL	I-License
v2	O
.	O
</s>
<s>
The	O
latest	O
updates	O
are	O
available	O
from	O
CTAN	B-General_Concept
.	O
</s>
<s>
LaTeXML	B-Application
is	O
a	O
free	B-Application
,	O
public	O
domain	O
software	O
,	O
written	O
in	O
Perl	B-Language
,	O
which	O
converts	O
LaTeX	B-Application
documents	O
to	O
a	O
variety	O
of	O
structured	O
formats	O
,	O
including	O
HTML5	B-Application
(	O
with	O
MathML	B-Language
)	O
,	O
epub	O
(	O
encapsulation	O
of	O
HTML	B-Language
)	O
,	O
jats	O
,	O
tei	B-Language
.	O
</s>
<s>
Pandoc	B-Language
is	O
a	O
'	O
universal	O
document	O
converter	O
 '	O
able	O
to	O
transform	O
LaTeX	B-Application
into	O
many	O
different	O
file	O
formats	O
,	O
including	O
HTML5	B-Application
,	O
epub	O
,	O
rtf	O
and	O
docx	B-Operating_System
.	O
</s>
<s>
It	O
is	O
licensed	O
under	O
GNU	B-License
GPL	I-License
v2	O
.	O
</s>
<s>
LaTeX	B-Application
has	O
become	O
the	O
de	O
facto	O
standard	O
to	O
typeset	O
mathematical	O
expression	O
in	O
scientific	O
documents	O
.	O
</s>
<s>
Hence	O
,	O
there	O
are	O
several	O
conversion	O
tools	O
focusing	O
on	O
mathematical	O
LaTeX	B-Application
expressions	O
,	O
such	O
as	O
converters	O
to	O
MathML	B-Language
or	O
Computer	B-General_Concept
Algebra	I-General_Concept
System	I-General_Concept
.	O
</s>
<s>
MathJax	B-Language
is	O
a	O
JavaScript	B-Language
library	O
for	O
converting	O
LaTeX	B-Application
to	O
MathML	B-Language
,	O
picture	O
formats	O
,	O
or	O
HTML	B-Language
.	O
</s>
<s>
The	O
Wikimedia	O
Foundation	O
uses	O
it	O
to	O
build	O
Mathoid	O
,	O
a	O
web-service	O
converter	O
using	O
Node.js	B-Language
that	O
converts	O
math	O
inputs	O
,	O
such	O
as	O
LaTeX	B-Application
,	O
to	O
MathML	B-Language
and	O
picture	O
formats	O
,	O
including	O
SVG	B-Application
and	O
PNG	O
.	O
</s>
<s>
KaTeX	B-Language
is	O
a	O
JavaScript	B-Language
library	O
for	O
converting	O
LaTeX	B-Application
to	O
HTML	B-Language
and	O
MathML	B-Language
.	O
</s>
<s>
It	O
is	O
developed	O
by	O
the	O
Khan	O
Academy	O
,	O
and	O
is	O
among	O
the	O
fastest	O
LaTeX	B-Application
to	O
HTML	B-Language
converters	O
.	O
</s>
<s>
LaTeX	B-Application
is	O
typically	O
distributed	O
along	O
with	O
plain	B-Application
TeX	I-Application
under	O
a	O
free	B-License
software	I-License
license	I-License
:	O
the	O
LaTeX	B-Application
Project	I-Application
Public	I-Application
License	I-Application
(	O
LPPL	B-Application
)	O
.	O
</s>
<s>
The	O
LPPL	B-Application
is	O
not	O
compatible	O
with	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
,	O
as	O
it	O
requires	O
that	O
modified	O
files	O
must	O
be	O
clearly	O
differentiable	O
from	O
their	O
originals	O
(	O
usually	O
by	O
changing	O
the	O
filename	O
)	O
;	O
this	O
was	O
done	O
to	O
ensure	O
that	O
files	O
that	O
depend	O
on	O
other	O
files	O
will	O
produce	O
the	O
expected	O
behavior	O
and	O
avoid	O
dependency	B-Protocol
hell	I-Protocol
.	O
</s>
<s>
The	O
LPPL	B-Application
is	O
DFSG	B-License
compliant	O
as	O
of	O
version	O
1.3	O
.	O
</s>
<s>
As	O
free	B-Application
software	I-Application
,	O
LaTeX	B-Application
is	O
available	O
on	O
most	O
operating	O
systems	O
,	O
which	O
include	O
UNIX	B-Application
(	O
Solaris	B-Application
,	O
HP-UX	B-Application
,	O
AIX	B-Application
)	O
,	O
BSD	B-Operating_System
(	O
FreeBSD	B-Operating_System
,	O
macOS	B-Application
,	O
NetBSD	B-Device
,	O
OpenBSD	B-Operating_System
)	O
,	O
Linux	B-Application
(	O
Red	O
Hat	O
,	O
Debian	O
,	O
Arch	O
,	O
Gentoo	B-Application
)	O
,	O
Windows	B-Application
,	O
DOS	B-Device
,	O
RISC	B-Operating_System
OS	I-Operating_System
,	O
AmigaOS	B-Application
and	O
Plan	B-Operating_System
9	I-Operating_System
.	O
</s>
<s>
LaTeX2e	O
is	O
the	O
current	O
version	O
of	O
LaTeX	B-Application
,	O
since	O
it	O
replaced	O
LaTeX	B-Application
2.09	O
in	O
1994	O
.	O
,	O
LaTeX3	B-Application
,	O
which	O
started	O
in	O
the	O
early	O
1990s	O
,	O
is	O
under	O
a	O
long-term	O
development	O
project	O
.	O
</s>
<s>
Some	O
LaTeX3	B-Application
features	O
are	O
available	O
in	O
LaTeX2e	O
using	O
packages	O
,	O
and	O
by	O
2020	O
many	O
features	O
have	O
been	O
enabled	O
in	O
LaTeX2e	O
by	O
default	O
for	O
a	O
gradual	O
transition	O
.	O
</s>
<s>
There	O
are	O
numerous	O
commercial	O
implementations	O
of	O
the	O
entire	O
TeX	B-Application
system	O
.	O
</s>
<s>
LyX	B-Language
is	O
a	O
free	B-Application
,	O
WYSIWYM	B-General_Concept
visual	O
document	O
processor	O
that	O
uses	O
LaTeX	B-Application
for	O
a	O
back-end	O
.	O
</s>
<s>
TeXmacs	B-Application
is	O
a	O
free	B-Application
,	O
WYSIWYG	B-Application
editor	I-Application
with	O
similar	O
functionalities	O
as	O
LaTeX	B-Application
,	O
but	O
with	O
a	O
different	O
typesetting	O
engine	O
.	O
</s>
<s>
Other	O
WYSIWYG	B-Application
editors	I-Application
that	O
produce	O
LaTeX	B-Application
include	O
Scientific	B-Application
Word	I-Application
on	O
Windows	B-Application
,	O
and	O
BaKoMa	O
TeX	B-Application
on	O
Windows	B-Application
,	O
Mac	O
and	O
Linux	B-Application
.	O
</s>
<s>
A	O
number	O
of	O
community-supported	O
TeX	B-Application
distributions	O
are	O
available	O
.	O
</s>
