<s>
Box2D	B-Application
is	O
a	O
free	B-Application
open	B-Application
source	I-Application
2-dimensional	O
physics	O
simulator	O
engine	O
written	O
in	O
C++	B-Language
by	O
Erin	O
Catto	O
and	O
published	O
under	O
the	B-License
MIT	I-License
license	I-License
.	O
</s>
<s>
It	O
has	O
been	O
used	O
in	O
Crayon	B-Application
Physics	I-Application
Deluxe	I-Application
,	O
Limbo	B-Application
,	O
Rolando	B-Application
,	O
Incredibots	B-Application
,	O
Angry	B-Application
Birds	I-Application
,	O
Tiny	B-Operating_System
Wings	I-Operating_System
,	O
Shovel	B-Application
Knight	I-Application
,	O
Transformice	B-Protocol
,	O
Happy	B-Application
Wheels	I-Application
,	O
and	O
many	O
online	O
Flash	O
games	O
,	O
as	O
well	O
as	O
iPhone	B-Device
,	O
iPad	O
and	O
Android	B-Application
games	O
using	O
the	O
Cocos2d	B-Application
or	O
Moscrif	O
game	O
engine	O
and	O
Corona	B-Operating_System
framework	I-Operating_System
.	O
</s>
<s>
Box2D	B-Application
was	O
first	O
released	O
as	O
"	O
Box2D	B-Application
Lite	O
"	O
,	O
a	O
demonstration	O
engine	O
to	O
accompany	O
a	O
physics	O
presentation	O
given	O
by	O
Erin	O
Catto	O
at	O
GDC	O
2006	O
.	O
</s>
<s>
On	O
September	O
11	O
,	O
2007	O
,	O
it	O
was	O
released	O
as	O
open	B-Application
source	I-Application
on	O
SourceForge	B-Application
.	O
</s>
<s>
On	O
January	O
17	O
,	O
2010	O
,	O
Box	B-Application
2D	I-Application
moved	O
the	O
project	O
to	O
Google	B-Protocol
Code	I-Protocol
for	O
hosting	O
.	O
</s>
<s>
On	O
July	O
12	O
,	O
2015	O
,	O
hosting	O
was	O
moved	O
again	O
,	O
this	O
time	O
to	O
GitHub	B-Application
.	O
</s>
<s>
On	O
March	O
6	O
,	O
2008	O
,	O
version	O
2.0	O
was	O
launched	O
,	O
introducing	O
continuous	O
collision	O
detection	O
and	O
revamping	O
the	O
API	B-General_Concept
.	O
</s>
<s>
On	O
July	O
27	O
,	O
2020	O
,	O
version	O
2.4	O
was	O
launched	O
,	O
with	O
a	O
variety	O
of	O
changes	O
,	O
most	O
notably	O
the	O
license	O
was	O
changed	O
to	O
the	B-License
MIT	I-License
License	I-License
.	O
</s>
<s>
Box2D	B-Application
is	O
itself	O
written	O
in	O
platform-independent	O
C++	B-Language
(	O
usable	O
on	O
any	O
system	O
with	O
a	O
C++	B-Language
compiler	O
available	O
)	O
.	O
</s>
<s>
The	O
engine	O
may	O
be	O
compiled	O
in	O
fixed	O
point	O
and	O
floating	B-Algorithm
point	I-Algorithm
modes	O
,	O
and	O
has	O
been	O
used	O
on	O
the	O
Nintendo	B-Device
DS	I-Device
,	O
Wii	B-Operating_System
,	O
and	O
several	O
mobile	O
phones	O
(	O
including	O
Android	B-Application
,	O
BlackBerry	B-Application
10	I-Application
and	O
iOS	B-Application
)	O
as	O
well	O
as	O
most	O
major	O
operating	O
systems	O
.	O
</s>
<s>
The	O
engine	O
has	O
been	O
ported	O
to	O
many	O
other	O
programming	O
languages	O
and	O
environments	O
,	O
including	O
Java	B-Language
,	O
Adobe	B-Operating_System
Flash	I-Operating_System
(	O
in	O
ActionScript	B-Operating_System
and	O
Haxe	B-Language
languages	O
)	O
,	O
C#	B-Application
,	O
Lua	B-Language
,	O
JavaScript	B-Language
,	O
and	O
D	B-Application
.	O
Bindings	B-Application
exist	O
to	O
use	O
the	O
compiled	O
library	O
from	O
Python	B-Language
,	O
DarkBASIC	O
and	O
BBC	B-Language
BASIC	I-Language
.	O
</s>
<s>
On	O
October	O
30	O
,	O
2009	O
,	O
it	O
was	O
announced	O
that	O
Box2D	B-Application
was	O
being	O
integrated	O
into	O
the	O
(	O
now	O
older	O
)	O
Torque	B-Application
2D	I-Application
game	I-Application
engine	I-Application
.	O
</s>
<s>
GameMaker	B-Operating_System
:	I-Operating_System
Studio	I-Operating_System
,	O
uses	O
the	O
engine	O
for	O
physics	O
simulation	O
.	O
</s>
<s>
LibGDX	B-Library
,	O
uses	O
the	O
physics	O
engine	O
for	O
games	O
and	O
lighting	O
.	O
</s>
<s>
Stencyl	B-Application
,	O
uses	O
the	O
physics	O
engine	O
for	O
games	O
,	O
and	O
allows	O
export	O
to	O
Flash	O
and	O
iOS	B-Application
.	O
</s>
<s>
Box2D	B-Application
performs	O
constrained	O
rigid	O
body	O
simulation	O
.	O
</s>
<s>
Box2D	B-Application
's	O
collision	O
detection	O
and	O
resolution	O
system	O
consists	O
of	O
three	O
pieces	O
:	O
an	O
incremental	O
sweep	B-Algorithm
and	I-Algorithm
prune	I-Algorithm
broad	O
phase	O
,	O
a	O
continuous	O
collision	O
detection	O
unit	O
,	O
and	O
a	O
stable	O
linear-time	O
contact	O
solver	O
.	O
</s>
<s>
An	O
earlier	O
version	O
of	O
the	O
Box2D	B-Application
engine	O
,	O
now	O
known	O
as	O
Box2D	B-Application
Lite	O
,	O
was	O
released	O
primarily	O
for	O
educational	O
purposes	O
,	O
based	O
on	O
a	O
series	O
of	O
yearly	O
Game	O
Developers	O
Conference	O
presentations	O
that	O
Erin	O
Catto	O
has	O
given	O
.	O
</s>
<s>
Box2D	B-Application
Lite	O
uses	O
many	O
of	O
the	O
same	O
algorithms	O
as	O
Box2D	B-Application
,	O
but	O
has	O
a	O
smaller	O
feature	O
set	O
.	O
</s>
<s>
The	O
Chipmunk	B-Application
physics	I-Application
engine	I-Application
(	O
written	O
in	O
C	O
)	O
and	O
Phys2D	O
(	O
written	O
in	O
Java	B-Language
)	O
are	O
both	O
partially	O
based	O
on	O
Box2D	B-Application
Lite	O
.	O
</s>
<s>
The	O
physics	O
engine	O
used	O
in	O
SpriteKit	O
for	O
iOS	B-Application
and	O
OS	O
X	O
uses	O
Box2D	B-Application
internally	O
.	O
</s>
<s>
The	O
LiquidFun	O
physics	O
engine	O
is	O
a	O
fork	O
of	O
Box2D	B-Application
by	O
Google	B-Application
,	O
which	O
adds	O
fluid	O
simulation	O
to	O
the	O
engine	O
.	O
</s>
<s>
LibGDX	B-Library
uses	O
a	O
Java	B-Language
wrapper	O
around	O
native	O
Box2D	B-Application
code	O
written	O
in	O
C++	B-Language
as	O
its	O
physics	O
engine	O
.	O
</s>
<s>
Itterheim	O
and	O
Wenderlich	O
describe	O
the	O
usage	O
of	O
Box2D	B-Application
in	O
the	O
Cocos2d	B-Application
iPhone	B-Device
engine	O
.	O
</s>
<s>
An	O
article	O
in	O
the	O
Adobe	O
Edge	O
newsletter	O
discusses	O
the	O
use	O
of	O
Box2D	B-Application
in	O
Flash	O
games	O
.	O
</s>
