<s>
Grace	O
is	O
a	O
free	B-Application
WYSIWYG	B-Application
2D	O
graph	B-Application
plotting	I-Application
tool	O
,	O
for	O
Unix-like	B-Operating_System
operating	I-Operating_System
systems	I-Operating_System
.	O
</s>
<s>
Grace	O
uses	O
the	O
X	B-Operating_System
Window	I-Operating_System
System	I-Operating_System
and	O
Motif	B-Application
for	O
its	O
GUI	O
.	O
</s>
<s>
It	O
has	O
been	O
ported	O
to	O
VMS	B-Operating_System
,	O
OS/2	B-Application
,	O
and	O
Windows	B-Application
9*	O
/NT/2000/XP	O
(	O
on	O
Cygwin	B-Language
)	O
.	O
</s>
<s>
In	O
1996	O
,	O
Linux	B-Application
Journal	O
described	O
Xmgr	B-Application
(	O
an	O
early	O
name	O
for	O
Grace	O
)	O
as	O
one	O
of	O
the	O
two	O
most	O
prominent	O
graphing	O
packages	O
for	O
Linux	B-Application
.	O
</s>
<s>
Grace	O
is	O
a	O
descendant	O
of	O
the	O
ACE/gr	B-Application
plotting	B-Application
tool	O
(	O
also	O
known	O
as	O
Xvgr	O
)	O
,	O
based	O
on	O
Xview	O
libraries	O
from	O
OpenWindows	O
.	O
</s>
<s>
In	O
1996	O
,	O
development	O
was	O
taken	O
over	O
by	O
the	O
ACE/gr	B-Application
development	O
team	O
,	O
led	O
by	O
Evgeny	O
Stambulchik	O
at	O
the	O
Weizmann	O
Institute	O
of	O
Science	O
,	O
Israel	O
.	O
</s>
<s>
Development	O
of	O
Xmgr	B-Application
was	O
frozen	O
at	O
version	O
4.1.2	O
in	O
1998	O
and	O
the	O
Grace	O
project	O
was	O
started	O
as	O
a	O
fork	B-Application
,	O
released	O
under	O
the	O
GPL	B-License
.	O
</s>
<s>
The	O
name	O
stands	O
for	O
"	O
GRaphing	O
,	O
Advanced	O
Computation	O
and	O
Exploration	O
of	O
data	O
"	O
or	O
"	O
Grace	O
Revamps	O
ACE/gr	B-Application
"	O
Turner	O
still	O
maintains	O
a	O
non-public	O
version	O
of	O
Xmgr	B-Application
for	O
internal	O
use	O
.	O
</s>
<s>
Both	O
of	O
these	O
versions	O
of	O
Grace	O
work	O
natively	O
on	O
Windows	B-Application
operating	I-Application
systems	I-Application
and	O
had	O
releases	O
in	O
2017	O
.	O
</s>
<s>
Grace	O
can	O
be	O
used	O
from	O
a	O
point-and-click	O
interface	O
or	O
scripted	O
(	O
using	O
either	O
the	O
built-in	O
programming	O
language	O
or	O
a	O
number	O
of	O
language	B-Application
bindings	I-Application
)	O
.	O
</s>
<s>
It	O
performs	O
both	O
linear	B-General_Concept
and	O
nonlinear	O
least-squares	B-Algorithm
fitting	I-Algorithm
to	O
arbitrarily	O
complex	O
user-defined	O
functions	O
,	O
with	O
or	O
without	O
constraints	O
.	O
</s>
<s>
Other	O
analysis	O
tools	O
include	O
FFT	O
,	O
integration	O
and	O
differentiation	B-Algorithm
,	O
splines	B-Algorithm
,	O
interpolation	B-Algorithm
,	O
and	O
smoothing	O
.	O
</s>
