<s>
Shoes	O
is	O
a	O
GUI	O
toolkit	O
based	O
on	O
the	O
Ruby	B-Language
programming	I-Language
language	I-Language
.	O
</s>
<s>
Shoes	O
runs	O
on	O
Microsoft	B-Application
Windows	I-Application
,	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
and	O
Linux	B-Application
(	O
GTK+	B-Application
)	O
,	O
using	O
the	O
underlying	O
technologies	O
of	O
Cairo	B-Language
and	O
Pango	B-Language
.	O
</s>
<s>
lines	O
,	O
circles	O
,	O
and	O
even	O
physics	O
(	O
via	O
Chipmunk	B-Application
)	O
cRruby	O
extensions	O
.	O
</s>
<s>
Shoes	O
3	O
includes	O
its	O
own	O
embedded	O
MRI/cRuby	O
Ruby	B-Language
and	O
does	O
not	O
require	O
the	O
end	O
user	O
to	O
install	O
Ruby	B-Language
.	O
</s>
<s>
It	O
provides	O
a	O
customized	O
Rubygems	O
environment	O
that	O
does	O
not	O
conflict	O
with	O
any	O
existing	O
Ruby	B-Language
that	O
might	O
exist	O
.	O
</s>
<s>
Shoes	O
3.3	O
embraces	O
the	O
unique	O
things	O
that	O
MRI	O
Ruby	B-Language
can	O
do	O
with	O
native	O
extensions	O
and	O
gems	O
,	O
even	O
if	O
they	O
are	O
platform	O
specific	O
.	O
</s>
