<s>
The	O
Open	O
Physics	O
Abstraction	O
Layer	O
(	O
OPAL	B-Application
)	O
is	O
an	O
open	B-Application
source	I-Application
realtime	B-General_Concept
physics	O
engine	O
API	B-General_Concept
similar	O
to	O
PAL	O
.	O
</s>
<s>
It	O
is	O
currently	O
supported	O
only	O
by	O
ODE	B-Application
,	O
but	O
can	O
be	O
extended	O
to	O
run	O
off	O
of	O
other	O
engines	O
.	O
</s>
<s>
OPAL	B-Application
is	O
free	B-Application
software	I-Application
,	O
released	O
under	O
both	O
the	O
LGPL	B-Application
and	O
the	O
BSD	B-Operating_System
license	I-Operating_System
.	O
</s>
<s>
OPAL	B-Application
is	O
a	O
high-level	O
interface	O
for	O
low-level	O
physics	O
engines	O
used	O
in	O
games	O
,	O
robotics	O
simulations	O
,	O
and	O
other	O
3D	O
applications	O
.	O
</s>
<s>
Features	O
a	O
simple	O
C++	O
API	B-General_Concept
,	O
intuitive	O
objects	O
(	O
e.g.	O
</s>
<s>
The	O
latest	O
version	O
of	O
OPAL	B-Application
is	O
0.4.0	O
.	O
</s>
<s>
On	O
June	O
23	O
,	O
2010	O
,	O
OPAL	B-Application
development	O
officially	O
ended	O
.	O
</s>
