<s>
C.a.R.	B-Language
–	O
Compass	O
and	O
Ruler	O
(	O
also	O
known	O
as	O
Z.u.L.	B-Language
,	O
which	O
stands	O
for	O
the	O
German	O
"	O
Zirkel	O
und	O
Lineal	O
"	O
)	O
—	O
is	O
a	O
free	O
and	O
open	O
source	O
interactive	B-Application
geometry	I-Application
app	I-Application
that	O
can	O
do	O
geometrical	O
constructions	O
in	O
Euclidean	O
and	O
non-Euclidean	O
geometry	O
.	O
</s>
<s>
The	O
software	O
is	O
Java	B-Language
based	O
.	O
</s>
<s>
It	O
is	O
licensed	O
under	O
the	O
terms	O
of	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
(	O
GPL	B-License
)	O
.	O
</s>
<s>
Assignments	O
make	O
possible	O
to	O
create	O
Java	B-Language
applets	O
,	O
for	O
a	O
construction	O
exercises	O
.	O
</s>
<s>
These	O
applets	O
can	O
be	O
used	O
from	O
the	O
command	O
line	O
using	O
the	O
AppletViewer	B-Language
.	O
</s>
<s>
(	O
Previously	O
,	O
they	O
could	O
be	O
run	O
in	O
a	O
browser	O
,	O
but	O
Java	B-Language
support	O
in	O
browsers	O
has	O
been	O
disabled	O
in	O
recent	O
years	O
.	O
)	O
</s>
