<s>
Clozure	B-Application
CL	I-Application
(	O
CCL	O
)	O
is	O
a	O
Common	B-Language
Lisp	I-Language
implementation	O
.	O
</s>
<s>
It	O
implements	O
the	O
full	O
ANSI	B-Language
Common	I-Language
Lisp	I-Language
standard	I-Language
with	O
several	O
extensions	O
(	O
CLOS	O
MOP	O
,	O
threads	O
,	O
CLOS	O
conditions	O
,	O
CLOS	O
streams	O
,	O
...	O
)	O
.	O
</s>
<s>
It	O
contains	O
a	O
command	O
line	O
development	O
environment	O
,	O
an	O
experimental	O
integrated	B-Application
development	I-Application
environment	I-Application
(	O
IDE	B-Application
)	O
for	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
using	O
the	O
Hemlock	B-Application
editor	I-Application
,	O
and	O
can	O
also	O
be	O
used	O
with	O
SLIME	B-Operating_System
(	O
a	O
Common	B-Language
Lisp	I-Language
development	O
environment	O
for	O
GNU	B-Application
Emacs	I-Application
)	O
.	O
</s>
<s>
Clozure	B-Application
CL	I-Application
is	O
open	B-Application
source	I-Application
and	O
the	O
project	O
is	O
hosted	O
by	O
Clozure	B-Application
Associates	O
.	O
</s>
<s>
Clozure	B-Application
CL	I-Application
supports	O
the	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
,	O
Linux	B-Application
,	O
FreeBSD	B-Operating_System
,	O
Solaris	B-Application
and	O
Microsoft	B-Application
Windows	I-Application
platforms	O
.	O
</s>
<s>
There	O
are	O
32	O
and	O
64	O
bit	O
x86	B-Operating_System
variants	O
for	O
each	O
.	O
</s>
<s>
Additionally	O
,	O
there	O
are	O
PowerPC	B-Architecture
ports	O
for	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
and	O
Linux	B-Application
,	O
and	O
a	O
32-bit	O
ARM	B-Architecture
port	I-Architecture
for	O
Linux	B-Application
.	O
</s>
<s>
Clozure	B-Application
CL	I-Application
was	O
used	O
by	O
ITA	B-Application
Software	I-Application
for	O
the	O
business	O
logic	O
of	O
a	O
new	O
Airline	O
Reservation	O
System	O
.	O
</s>
<s>
Clozure	B-Application
CL	I-Application
is	O
also	O
commonly	O
used	O
as	O
an	O
underlying	O
Common	B-Language
Lisp	I-Language
implementation	O
for	O
the	O
ACL2	O
theorem	O
prover	O
.	O
</s>
<s>
Formerly	O
known	O
as	O
OpenMCL	B-Application
,	O
Clozure	B-Application
CL	I-Application
is	O
an	O
evolution	O
of	O
Macintosh	B-Language
Common	I-Language
Lisp	I-Language
.	O
</s>
<s>
CCL	O
's	O
compiler	B-Language
produces	O
native	O
instructions	O
for	O
Lisp	O
expressions	O
and	O
files	O
.	O
</s>
<s>
By	O
default	O
every	O
expression	O
entered	O
at	O
the	O
REPL	B-Application
is	O
compiled	B-Language
to	O
native	O
code	O
.	O
</s>
<s>
CCL	O
implements	O
built-in	O
facilities	O
to	O
easily	O
interface	O
with	O
C	O
and	O
Objective-C	O
libraries	O
(	O
Cocoa	O
bridge	O
)	O
and	O
these	O
are	O
used	O
to	O
implement	O
the	O
IDE	B-Application
amongst	O
other	O
things	O
.	O
</s>
<s>
The	O
IDE	B-Application
(	O
based	O
upon	O
the	O
Hemlock	B-Application
editor	I-Application
)	O
is	O
currently	O
labelled	O
as	O
experimental	O
.	O
</s>
