<s>
Interactive	O
geometry	O
software	O
(	O
IGS	O
)	O
or	O
dynamic	O
geometry	O
environments	O
(	O
DGEs	O
)	O
are	O
computer	B-Application
programs	I-Application
which	O
allow	O
one	O
to	O
create	O
and	O
then	O
manipulate	O
geometric	O
constructions	O
,	O
primarily	O
in	O
plane	O
geometry	O
.	O
</s>
<s>
This	O
was	O
soon	O
followed	O
by	O
Cabri	B-Application
in	O
1986	O
and	O
The	B-Application
Geometer	I-Application
's	I-Application
Sketchpad	I-Application
.	O
</s>
<s>
There	O
are	O
three	O
main	O
types	O
of	O
computer	O
environments	O
for	O
studying	O
school	O
geometry	O
:	O
supposers	O
,	O
dynamic	O
geometry	O
environments	O
(	O
DGEs	O
)	O
and	O
Logo-based	O
programs	O
.	O
</s>
<s>
Software	O
Cost	O
(	O
USD	O
)	O
Licence	O
Platforms	O
Cabri	B-Application
Geometry	I-Application
Windows	O
,	O
macOS	B-Operating_System
C.a.R.	B-Language
</s>
<s>
Software	O
Calculations	O
Macros	O
Loci	O
Animations	O
Scripting	O
Assignments	O
LaTeX	B-Application
export	O
Web	O
export	O
Multilingual	O
Proofs	O
Extra	O
Cabri	B-Application
II	O
Plus	O
(	O
with	O
plug-in	O
)	O
(	O
on	O
relations	O
)	O
Available	O
on	O
TI	O
Calculator	O
Calques	O
3D	O
(	O
FRA	O
ENG	O
DEU	O
ESP	O
PTG	O
)	O
(	O
on	O
relations	O
)	O
Experimental	O
connection	O
with	O
some	O
CAS	O
CaR	O
CaRMetal	B-Language
(	O
recursive	O
)	O
(	O
multiple	O
)	O
(	O
JavaScript	O
)	O
(	O
probabilistic	O
)	O
Amodality	O
,	O
folder	O
system	O
,	O
the	O
Monkey	O
Cinderella	B-Application
(	O
PDF	O
)	O
Probabilistic	O
Several	O
geometries	O
,	O
Physics	O
simulations	O
Ganja.js	O
2D	O
and	O
3D	O
,	O
projective	O
and	O
conformal	O
,	O
Geometric	O
Algebra	O
.	O
</s>
<s>
GCLC	O
Readable	O
proofs	O
,	O
support	O
for	O
3D	O
GeoGebra	B-Language
(	O
JavaScript	O
)	O
(	O
PSTricks	O
&	O
PGF/TikZ	O
)	O
(	O
55	O
languages	O
)	O
CAS	O
,	O
HTML5	B-Application
Export	O
(	O
from	O
version	O
4.2	O
)	O
3D	O
&	O
Automatic	O
Proof	O
(	O
from	O
version	O
5.0	O
)	O
Geometria	O
Two-role	O
(	O
teacher	O
,	O
student	O
)	O
model	O
Geometrix	O
Interactive	O
proof	O
,	O
diagram	O
checking	O
,	O
teacher/student	O
models	O
,	O
labels	O
with	O
dynamic	O
placeholders	O
Geometry	O
Expressions	O
(	O
Interactive	O
HTML5/JS	O
Apps	O
)	O
Symbolic	O
calculations	O
,	O
which	O
can	O
be	O
copied	O
as	O
input	O
for	O
CAS	O
,	O
TeX	O
,	O
and	O
source	O
code	O
in	O
21	O
formats/languages	O
.	O
</s>
<s>
Website	O
for	O
exported	O
HTML5	B-Application
Canvas	O
and	O
JavaScript	O
Interactive	O
Apps	O
(	O
Euclid	O
's	O
Muse	O
)	O
.	O
</s>
<s>
GeoNext	O
Available	O
as	O
a	O
web	O
app	O
Géoplan-Géospace	O
(	O
activeX	O
)	O
Sequences	O
,	O
2D	O
&	O
3D	O
,	O
human	O
readable	O
file	O
format	O
GeoProof	O
Automatic	O
formal	O
proofs	O
GEUP	B-Application
iGeom	O
Probabilist	O
Recurrent	O
scripts	O
Kig	B-Language
(	O
Python	O
)	O
(	O
PSTricks	O
)	O
Labels	O
with	O
dynamic	O
placeholders	O
Live	O
Geometry	O
Includes	O
player	O
.	O
</s>
<s>
Software	O
Arbitrary	O
Precision	O
Arithmetic	O
expressions	O
Trigonometric	O
functions	O
If	O
Object	O
existence	O
test	O
Cabri	B-Application
Calques	O
3D	O
C.a.R.	B-Language
</s>
<s>
Software	O
PNG	O
BMP	B-Device
TIFF	O
GIF	O
SWF	O
SVG	B-Application
EMF	O
Fig	O
Postscript	B-Language
Pdf	O
LaTeX/Eukleides	O
LaTeX/Pstricks	O
LaTeX/PGF/TikZ	O
Asymptote	O
Calques	O
3D	O
C.a.R.	B-Language
</s>
<s>
Software	O
Color	O
Filled/Not	O
filled	O
Width	O
Transparency	O
Shown/Hidden	O
Layer	O
Shape	O
of	O
points	O
Type	O
of	O
line	O
Cabri	B-Application
Calques	O
3D	O
C.a.R.	B-Language
</s>
<s>
C.a.R.	B-Language
</s>
<s>
is	O
a	O
free	O
GPL	B-License
analog	O
of	O
The	B-Application
Geometer	I-Application
's	I-Application
Sketchpad	I-Application
(	O
GSP	O
)	O
,	O
written	O
in	O
Java	B-Language
.	O
</s>
<s>
CaRMetal	B-Language
is	O
a	O
free	O
GPL	B-License
software	O
written	O
in	O
Java	B-Language
.	O
</s>
<s>
Derived	O
from	O
C.a.R.	B-Language
,	O
it	O
provides	O
a	O
different	O
user	O
interface	O
.	O
</s>
<s>
Cinderella	B-Application
,	O
written	O
in	O
Java	B-Language
,	O
is	O
very	O
different	O
from	O
The	B-Application
Geometer	I-Application
's	I-Application
Sketchpad	I-Application
.	O
</s>
<s>
The	O
later	O
version	O
Cinderella.2	O
also	O
includes	O
a	O
physics	O
simulation	O
engine	O
and	O
a	O
scripting	O
language	O
.	O
</s>
<s>
Dr	O
Genius	B-Language
was	O
an	O
attempt	O
to	O
merge	O
Dr.	B-Application
Geo	I-Application
and	O
the	O
Genius	B-Language
calculator	I-Language
.	O
</s>
<s>
Dr.	B-Application
Geo	I-Application
is	O
a	O
GPL	B-License
interactive	O
software	O
intended	O
for	O
younger	O
students	O
(	O
7-15	O
)	O
.	O
</s>
<s>
The	O
later	O
version	O
,	O
Dr.	O
GeoII	O
,	O
is	O
a	O
complete	O
rewrite	O
of	O
Dr.	B-Application
Geo	I-Application
,	O
for	O
the	O
Squeak/Smalltalk	O
environment	O
.	O
</s>
<s>
There	O
are	O
several	O
output	O
formats	O
,	O
including	O
LaTeX	B-Application
,	O
LaTeX/PStricks	O
,	O
LaTeX/Tikz	O
,	O
SVG	B-Application
and	O
PostScript	B-Language
.	O
</s>
<s>
GCLC	O
is	O
available	O
for	O
Windows	O
and	O
Linux	B-Application
.	O
</s>
<s>
GeoGebra	B-Language
is	O
software	O
that	O
combines	O
geometry	O
,	O
algebra	O
and	O
calculus	O
for	O
mathematics	O
education	O
in	O
schools	O
and	O
universities	O
.	O
</s>
<s>
Spreadsheet	O
:	O
Yes	O
,	O
the	O
cells	O
can	O
contain	O
any	O
GeoGebra	B-Language
object	O
(	O
numbers	O
,	O
points	O
,	O
functions	O
etc	O
.	O
)	O
</s>
<s>
It	O
emphasises	O
use	O
with	O
a	O
Computer	B-General_Concept
Algebra	I-General_Concept
System	I-General_Concept
(	O
CAS	O
)	O
,	O
as	O
well	O
as	O
exporting	O
and	O
sharing	O
via	O
interactive	O
HTML5	B-Application
,	O
Lua	B-Language
,	O
and	O
OS	B-Operating_System
X	I-Operating_System
dashboard	O
widget	O
apps	O
.	O
</s>
<s>
Geonext	O
was	O
developed	O
by	O
the	O
University	O
of	O
Bayreuth	O
until	O
2007	O
and	O
is	O
completely	O
implemented	O
in	O
Java	B-Language
.	O
</s>
<s>
GeoProof	O
is	O
a	O
free	O
GPL	B-License
dynamic	O
geometry	O
software	O
,	O
written	O
in	O
OCaml	B-Language
.	O
</s>
<s>
GEUP	B-Application
is	O
a	O
more	O
calculus-oriented	O
analog	O
of	O
The	B-Application
Geometer	I-Application
's	I-Application
Sketchpad	I-Application
.	O
</s>
<s>
GRACE	O
(	O
The	O
Graphical	O
Ruler	O
And	O
Compass	O
Editor	O
)	O
is	O
an	O
analog	O
of	O
The	B-Application
Geometer	I-Application
's	I-Application
Sketchpad	I-Application
(	O
GSP	O
)	O
,	O
written	O
in	O
Java	B-Language
.	O
</s>
<s>
Kig	B-Language
is	O
a	O
free	O
(	O
GPL	B-License
)	O
analog	O
of	O
The	B-Application
Geometer	I-Application
's	I-Application
Sketchpad	I-Application
(	O
GSP	O
)	O
for	O
KDE	B-Application
,	O
but	O
more	O
calculus-oriented	O
.	O
</s>
<s>
It	O
is	O
a	O
part	O
of	O
the	O
KDE	B-Language
Edutainment	I-Language
Project	I-Language
.	O
</s>
<s>
KmPlot	B-Operating_System
is	O
a	O
mathematical	O
function	O
plotter	O
released	O
under	O
the	O
free	O
GPL	B-License
license	I-License
.	O
</s>
<s>
KSEG	B-Language
is	O
a	O
free	O
(	O
GPL	B-License
)	O
analog	O
of	O
The	B-Application
Geometer	I-Application
's	I-Application
Sketchpad	I-Application
(	O
GSP	O
)	O
with	O
some	O
unique	O
features	O
.	O
</s>
<s>
Live	O
Geometry	O
is	O
a	O
free	O
CodePlex	B-Protocol
project	O
that	O
lets	O
you	O
create	O
interactive	O
ruler	O
and	O
compass	O
constructions	O
and	O
experiment	O
with	O
them	O
.	O
</s>
<s>
It	O
is	O
written	O
in	O
Silverlight	B-Application
4	O
and	O
C#	O
4.0	O
(	O
Visual	O
Studio	O
2010	O
)	O
.	O
</s>
<s>
The	O
project	O
has	O
two	O
front-ends	O
:	O
WPF	O
and	O
Silverlight	B-Application
,	O
which	O
both	O
share	O
the	O
common	O
DynamicGeometry	O
library	O
.	O
</s>
<s>
TracenPoche	B-Application
is	O
a	O
completely	O
Adobe	B-Operating_System
Flash	I-Operating_System
program	O
.	O
</s>
<s>
Euler	B-Language
3D	O
is	O
a	O
program	O
that	O
allows	O
you	O
to	O
create	O
and	O
manipulate	O
your	O
own	O
polyhedrons	O
.	O
</s>
<s>
GeoGebra	B-Language
can	O
be	O
deterministic	O
or	O
continuous	O
(	O
one	O
can	O
change	O
it	O
in	O
preferences	O
)	O
.	O
</s>
<s>
All	O
constructions	O
in	O
the	O
deterministic	O
programs	O
(	O
GSP	O
,	O
Cabri	B-Application
,	O
Kseg	B-Language
and	O
most	O
of	O
others	O
)	O
are	O
completely	O
determined	O
by	O
the	O
given	O
points	O
but	O
the	O
result	O
of	O
some	O
constructions	O
can	O
jump	O
or	O
behave	O
unexpectedly	O
when	O
a	O
given	O
point	O
is	O
moved	O
.	O
</s>
<s>
On	O
the	O
contrary	O
,	O
some	O
constructions	O
in	O
continuous	O
programs	O
(	O
so	O
far	O
only	O
Cinderella	B-Application
and	O
GeoGebra	B-Language
)	O
,	O
depend	O
on	O
the	O
number	O
of	O
hidden	O
parameters	O
and	O
in	O
such	O
a	O
way	O
that	O
moving	O
a	O
given	O
point	O
produces	O
a	O
continuous	O
motion	O
of	O
the	O
construction	O
,	O
as	O
a	O
result	O
,	O
if	O
the	O
point	O
is	O
moved	O
back	O
to	O
the	O
original	O
position	O
the	O
result	O
of	O
construction	O
might	O
be	O
different	O
.	O
</s>
