<s>
An	O
ECMAScript	B-Language
engine	I-Language
is	O
a	O
program	O
that	O
executes	O
source	O
code	O
written	O
in	O
a	O
version	O
of	O
the	O
ECMAScript	B-Language
language	O
standard	O
,	O
for	O
example	O
,	O
JavaScript	B-Language
.	O
</s>
<s>
These	O
are	O
new	O
generation	O
ECMAScript	B-Language
engines	I-Language
for	O
web	O
browsers	O
,	O
all	O
implementing	O
just-in-time	O
compilation	O
(	O
JIT	O
)	O
or	O
variations	O
of	O
that	O
idea	O
.	O
</s>
<s>
The	O
performance	O
benefits	O
for	O
just-in-time	O
compilation	O
make	O
it	O
much	O
more	O
suitable	O
for	O
web	O
applications	O
written	O
in	O
JavaScript	B-Language
.	O
</s>
<s>
Carakan	O
:	O
A	O
JavaScript	B-Language
engine	I-Language
developed	O
by	O
Opera	B-Application
Software	O
ASA	O
,	O
included	O
in	O
the	O
10.50	O
release	O
of	O
the	O
Opera	B-Application
web	I-Application
browser	I-Application
,	O
until	O
switching	O
to	O
V8	B-Language
with	O
Opera	B-Application
15	O
(	O
released	O
in	O
2013	O
)	O
.	O
</s>
<s>
Chakra	B-Language
(	O
JScript9	O
)	O
:	O
A	O
JScript	B-Language
engine	O
used	O
in	O
Internet	B-Application
Explorer	I-Application
.	O
</s>
<s>
It	O
was	O
first	O
previewed	O
at	O
MIX	O
10	O
as	O
part	O
of	O
the	O
Internet	B-Application
Explorer	I-Application
9	O
Platform	O
Preview	O
.	O
</s>
<s>
Chakra	B-Language
:	O
A	O
JavaScript	B-Language
engine	I-Language
previously	O
used	O
in	O
older	O
versions	O
of	O
Microsoft	B-Application
Edge	I-Application
,	O
before	O
being	O
replaced	O
by	O
V8	B-Language
.	O
</s>
<s>
SpiderMonkey	B-Language
:	O
A	O
JavaScript	B-Language
engine	I-Language
in	O
Mozilla	B-Language
Gecko	I-Language
applications	O
,	O
including	O
Firefox	B-Application
.	O
</s>
<s>
The	O
engine	O
currently	O
includes	O
the	O
IonMonkey	O
compiler	O
and	O
OdinMonkey	O
optimization	O
module	O
,	O
has	O
previously	O
included	O
the	O
TraceMonkey	O
compiler	O
(	O
first	O
JavaScript	B-Language
JIT	O
)	O
and	O
JägerMonkey	O
.	O
</s>
<s>
JavaScriptCore	O
:	O
A	O
JavaScript	B-Language
interpreter	O
and	O
JIT	O
originally	O
derived	O
from	O
KJS	B-Language
.	O
</s>
<s>
It	O
is	O
used	O
in	O
the	O
WebKit	B-Language
project	O
and	O
applications	O
such	O
as	O
Safari	B-Application
.	O
</s>
<s>
JScript	B-Language
.NET	I-Language
:	O
A	O
.NET	B-Application
Framework	I-Application
JScript	B-Language
engine	O
used	O
in	O
ASP.NET	B-Application
based	O
on	O
Common	O
Language	O
Runtime	O
and	O
COM	B-Device
Interop	I-Device
.	O
</s>
<s>
Unfortunately	O
support	O
was	O
dropped	O
with	O
.NET	B-Application
Core	I-Application
and	O
CoreCLR	O
so	O
its	O
future	O
looks	O
questionable	O
for	O
ASP.NET	B-Application
Core	I-Application
.	O
</s>
<s>
Tamarin	B-Language
:	O
An	O
ActionScript	B-Operating_System
and	O
ECMAScript	B-Language
engine	I-Language
used	O
in	O
Adobe	B-Operating_System
Flash	I-Operating_System
.	O
</s>
<s>
V8	B-Language
:	O
A	O
JavaScript	B-Language
engine	I-Language
used	O
in	O
Google	B-Application
Chrome	I-Application
and	O
other	O
Chromium-based	O
browsers	O
,	O
Node.js	B-Language
,	O
Deno	B-Application
,	O
and	O
V8.NET	O
.	O
</s>
<s>
Nashorn	B-Language
:	O
A	O
JavaScript	B-Language
engine	I-Language
used	O
in	O
Oracle	B-Device
Java	I-Device
Development	O
Kit	O
(	O
JDK	B-Language
)	O
since	O
version	O
8	O
.	O
</s>
<s>
iv	O
,	O
ECMAScript	B-Language
Lexer	O
/	O
Parser	O
/	O
Interpreter	O
/	O
VM	O
/	O
method	O
JIT	O
written	O
in	O
C++	O
.	O
</s>
<s>
CL-JavaScript	O
:	O
Can	O
compile	O
JavaScript	B-Language
to	O
machine	O
language	O
on	O
Common	O
Lisp	O
implementations	O
that	O
compile	O
to	O
machine	O
language	O
.	O
</s>
<s>
BESEN	O
:	O
A	O
complete	O
JIT-compiling	O
implementation	O
of	O
ECMAScript	B-Language
Fifth	O
Edition	O
written	O
in	O
Object	O
Pascal	O
.	O
</s>
<s>
Graal.js	O
:	O
An	O
ECMAScript	B-Language
compliant	O
JavaScript	B-Language
engine	I-Language
for	O
GraalVM	B-Language
which	O
supports	O
language	O
interoperability	O
that	O
can	O
also	O
execute	O
Node.js	B-Language
applications	O
.	O
</s>
<s>
Continuum	O
:	O
A	O
self-interpreter	O
that	O
supports	O
older	O
drafts	O
of	O
the	O
ECMAScript	B-Language
2015	O
specification	O
.	O
</s>
<s>
Uniquely	O
,	O
the	O
engine	O
is	O
implemented	O
in	O
ECMAScript	B-Language
3	O
,	O
which	O
made	O
it	O
possible	O
to	O
run	O
ES2015	O
in	O
browsers	O
as	O
old	O
as	O
IE6	O
.	O
</s>
<s>
Futhark	O
:	O
The	O
ECMAScript	B-Language
engine	I-Language
of	O
the	O
Opera	B-Application
web	I-Application
browser	I-Application
versions	O
9.50	O
to	O
10.10	O
.	O
</s>
<s>
InScript	B-Language
:	O
An	O
obsolete	O
proprietary	B-Application
library	O
used	O
for	O
iCab	B-Operating_System
2	O
and	O
3	O
.	O
</s>
<s>
JScript	B-Language
:	O
The	O
engine	O
that	O
is	O
used	O
in	O
Internet	B-Application
Explorer	I-Application
for	O
versions	O
up	O
to	O
IE9	O
,	O
and	O
one	O
component	O
of	O
the	O
MSHTML	B-Application
(	O
Trident	B-Application
)	O
browser	B-Protocol
engine	I-Protocol
.	O
</s>
<s>
KJS	B-Language
:	O
The	O
engine	O
used	O
in	O
Konqueror	B-Application
,	O
and	O
one	O
component	O
of	O
KHTML	B-Language
,	O
a	O
predecessor	O
to	O
JavaScriptCore	O
.	O
</s>
<s>
Linear	O
B	O
:	O
The	O
ECMAScript	B-Language
engine	I-Language
of	O
the	O
Opera	B-Application
web	I-Application
browser	I-Application
versions	O
7.0	O
to	O
9.50	O
,	O
exclusive	O
.	O
</s>
<s>
Narcissus	O
:	O
JavaScript	B-Language
implemented	O
in	O
JavaScript	B-Language
(	O
a	O
meta-circular	B-Application
evaluator	I-Application
)	O
,	O
intended	O
to	O
run	O
in	O
another	O
JavaScript	B-Language
engine	I-Language
,	O
of	O
theoretical	O
and	O
educational	O
nature	O
only	O
.	O
</s>
<s>
JS-Interpreter	O
A	O
lightweight	O
JavaScript	B-Language
interpreter	O
implemented	O
in	O
JavaScript	B-Language
with	O
step-by-step	O
execution	O
.	O
</s>
<s>
QtScript	B-Language
:	O
Originally	O
developed	O
by	O
Trolltech	O
,	O
now	O
owned	O
by	O
The	O
Qt	O
Company	O
.	O
</s>
<s>
V4	O
(	O
QJSEngine	O
)	O
:	O
Qt	O
's	O
newer	O
ECMAScript	B-Language
engine	I-Language
,	O
powering	O
QML	O
and	O
QtQuick	O
.	O
</s>
<s>
Rhino	B-Language
:	O
One	O
of	O
several	O
JavaScript	B-Language
engines	I-Language
from	O
Mozilla	B-Operating_System
,	O
using	O
the	O
Java	B-Device
platform	I-Device
.	O
</s>
<s>
YAJI	O
:	O
An	O
ECMAScript	B-Language
engine	I-Language
based	O
on	O
the	O
FESI	O
implementation	O
by	O
Jean-Marc	O
Lugrin	O
in	O
1999	O
,	O
using	O
the	O
Java	B-Device
platform	I-Device
,	O
currently	O
being	O
developed	O
to	O
support	O
the	O
latest	O
standards	O
(	O
ECMAScript	B-Language
spec	O
.	O
</s>
<s>
Microvium	O
:	O
JavaScript	B-Language
engine	I-Language
for	O
microcontrollers	B-Architecture
,	O
supporting	O
a	O
restricted	O
subset	O
of	O
the	O
ECMAScript	B-Language
specification	O
,	O
using	O
less	O
than	O
16kB	O
of	O
flash	O
memory	O
and	O
64B	O
of	O
RAM	O
while	O
idle	O
.	O
</s>
<s>
Duktape	O
:	O
A	O
small	O
footprint	O
,	O
easily	O
embeddable	O
Ecmascript	B-Language
E5/E5.1	O
engine	O
.	O
</s>
<s>
XS	O
JavaScript	B-Language
Engine	I-Language
:	O
An	O
ECMAScript	B-Language
2020-compliant	O
engine	O
for	O
microcontrollers	B-Architecture
with	O
limited	O
resources	O
.	O
</s>
<s>
XS	O
is	O
maintained	O
by	O
Moddable	O
as	O
part	O
of	O
the	O
Moddable	O
SDK	O
and	O
was	O
formerly	O
part	O
of	O
the	O
Kinoma	B-Operating_System
Platform	I-Operating_System
.	O
</s>
<s>
Jsish	B-Language
:	O
An	O
ES5.1	O
subset	O
interpreter	O
with	O
builtin	O
SQLite	O
,	O
JSON	O
,	O
WebSocket	O
,	O
and	O
ZVFS	O
support	O
.	O
</s>
<s>
Websocket.js	O
:	O
An	O
embeddable	O
Javascript	B-Language
engine	I-Language
with	O
HTTP/Websocket	O
support	O
.	O
</s>
<s>
Espruino	B-Device
:	O
A	O
very	O
small	O
footprint	O
interpreter	O
specifically	O
for	O
microcontrollers	B-Architecture
.	O
</s>
<s>
MuJS	O
:	O
A	O
lightweight	O
ECMAScript	B-Language
interpreter	O
library	O
,	O
designed	O
for	O
embedding	O
in	O
other	O
software	O
to	O
extend	O
them	O
with	O
scripting	O
capabilities	O
.	O
</s>
<s>
Originally	O
developed	O
for	O
MuPDF	B-Language
.	O
</s>
<s>
mJS	O
:	O
Restricted	O
JavaScript	B-Language
engine	I-Language
.	O
</s>
<s>
Tiny-JS	O
:	O
A	O
minimal	O
JavaScript	B-Language
interpreter	O
written	O
in	O
C++	O
.	O
</s>
<s>
JerryScript	O
:	O
A	O
lightweight	O
JavaScript	B-Language
engine	I-Language
by	O
Samsung	O
for	O
microcontrollers	B-Architecture
with	O
less	O
than	O
64KB	O
RAM	O
.	O
</s>
<s>
njs	O
:	O
A	O
lightweight	O
JavaScript	B-Language
interpreter	O
optimized	O
for	O
web	O
server	O
scripting	O
and	O
fastest	O
VM	O
context	O
creation	O
;	O
used	O
in	O
nginx	B-Operating_System
.	O
</s>
<s>
QuickJS	O
:	O
A	O
lightweight	O
ECMAScript	B-Language
6	O
interpreter	O
by	O
Fabrice	O
Bellard	O
and	O
Charlie	O
Gordon	O
.	O
</s>
<s>
engine262	O
:	O
A	O
JavaScript	B-Language
engine	I-Language
written	O
in	O
JavaScript	B-Language
for	O
development	O
and	O
exploration	O
.	O
</s>
<s>
It	O
is	O
primarily	O
used	O
to	O
validate	O
the	O
ECMAScript	B-Language
specification	O
.	O
</s>
<s>
Boa	O
:	O
A	O
JavaScript	B-Language
engine	I-Language
written	O
in	O
Rust	B-Application
.	O
</s>
<s>
ScriptEase	O
:	O
an	O
old	O
proprietary	B-Application
engine	O
last	O
updated	O
in	O
2003	O
.	O
</s>
