<s>
PowerPlant	B-Library
is	O
an	O
object-oriented	B-Language
GUI	B-Library
toolkit	I-Library
,	O
application	B-Application
framework	I-Application
and	O
set	O
of	O
class	O
libraries	O
for	O
the	O
Classic	B-Application
Mac	I-Application
OS	I-Application
,	O
created	O
by	O
Metrowerks	O
.	O
</s>
<s>
The	O
framework	O
was	O
fairly	O
popular	O
during	O
the	O
late	O
(	O
OS	O
versions	O
8	O
and	O
9	O
)	O
Classic	B-Application
Mac	I-Application
OS	I-Application
era	O
,	O
and	O
was	O
primarily	O
used	O
with	O
CodeWarrior	B-Operating_System
.	O
</s>
<s>
It	O
was	O
designed	O
to	O
work	O
with	O
a	O
GUI	O
editor	O
called	O
Constructor	O
,	O
which	O
was	O
primarily	O
a	O
resource	B-Operating_System
editor	O
specializing	O
in	O
UI	O
elements	O
.	O
</s>
<s>
Constructor	O
used	O
several	O
custom	O
resource	B-Operating_System
types	O
,	O
'	O
PPob	O
 '	O
(	O
"	O
PowerPlant	B-Library
object	O
"	O
—	O
a	O
general	O
view	O
description	O
)	O
,	O
'	O
CTYP	O
 '	O
(	O
custom	O
widgets	O
)	O
,	O
and	O
Mcmd	O
(	O
used	O
for	O
dispatching	O
menu-related	O
events	O
)	O
.	O
</s>
<s>
Later	O
it	O
was	O
ported	O
to	O
also	O
support	O
MacOS	B-Application
X	I-Application
development	O
with	O
a	O
single	O
code	O
base	O
.	O
</s>
<s>
After	O
Metrowerks	O
was	O
acquired	O
by	O
Motorola	O
,	O
then	O
spun	O
out	O
as	O
part	O
of	O
Freescale	O
Semiconductor	O
,	O
PowerPlant	B-Library
and	O
the	O
rest	O
of	O
the	O
CodeWarrior	B-Operating_System
desktop	O
development	O
tools	O
were	O
discontinued	O
.	O
</s>
<s>
During	O
its	O
heyday	O
from	O
the	O
mid-1990s	O
until	O
the	O
early	O
2000s	O
,	O
PowerPlant	B-Library
was	O
the	O
most	O
popular	O
framework	O
available	O
for	O
Mac	O
programmers	O
,	O
replacing	O
both	O
the	O
THINK	O
Class	O
Library	O
and	O
MacApp	B-Operating_System
as	O
the	O
premier	O
object-oriented	B-Language
toolkit	O
for	O
the	O
MacOS	B-Application
;	O
however	O
,	O
the	O
transition	O
to	O
MacOS	B-Application
X	I-Application
was	O
rather	O
difficult	O
for	O
many	O
PowerPlant	B-Library
programmers	O
.	O
</s>
<s>
In	O
1997	O
,	O
there	O
was	O
no	O
plan	O
to	O
port	O
PowerPlant	B-Library
to	O
the	O
Yellow	O
Box	O
API	O
found	O
on	O
Rhapsody	O
,	O
a	O
radically	O
different	O
API	O
that	O
would	O
become	O
Cocoa	B-Operating_System
,	O
the	O
official	O
MacOS	B-Application
X	I-Application
API	O
.	O
</s>
<s>
Instead	O
Metrowerks	O
plan	O
was	O
to	O
port	O
PowerPlant	B-Library
using	O
Codewarior	O
Latitude	O
,	O
a	O
Mac	O
to	O
UNIX	O
porting	O
library	O
they	O
acquired	O
recently	O
.	O
</s>
<s>
In	O
2000	O
,	O
as	O
Apple	O
revised	O
its	O
transition	O
plans	O
,	O
PowerPlant	B-Library
was	O
ported	O
to	O
Carbon	B-Operating_System
,	O
with	O
the	O
Aqua	O
user	O
interface	O
on	O
MacOS	B-Application
X	I-Application
,	O
offering	O
a	O
solution	O
for	O
developers	O
wanting	O
to	O
support	O
the	O
new	O
operating	O
system	O
.	O
</s>
<s>
A	O
new	O
version	O
,	O
PowerPlant	B-Library
X	O
,	O
was	O
introduced	O
in	O
2004	O
as	O
a	O
native	O
Carbon	B-Operating_System
framework	O
,	O
using	O
Carbon	B-Operating_System
Events	O
but	O
never	O
became	O
as	O
popular	O
on	O
Mac	B-Application
OS	I-Application
X	O
as	O
PowerPlant	B-Library
had	O
been	O
on	O
Classic	B-Application
Mac	I-Application
OS	I-Application
.	O
</s>
<s>
In	O
February	O
2006	O
,	O
the	O
PowerPlant	B-Library
class	O
libraries	O
were	O
released	O
as	O
open	O
source	O
under	O
the	O
BSD	B-Operating_System
license	I-Operating_System
hosted	O
on	O
SourceForge	B-Application
.	O
</s>
<s>
Although	O
it	O
could	O
theoretically	O
be	O
recompiled	O
for	O
x86-64	O
Macs	O
,	O
it	O
is	O
Carbon-dependent	O
and	O
therefore	O
can	O
only	O
be	O
used	O
in	O
32-bit	O
mode	O
,	O
which	O
preclude	O
its	O
use	O
for	O
software	O
to	O
run	O
on	O
macOS	B-Device
Catalina	I-Device
or	O
later	O
as	O
32-bit	O
application	O
support	O
was	O
dropped	O
by	O
the	O
system	O
.	O
</s>
