<s>
NoGravity	B-Application
is	O
a	O
space	O
flight	O
simulation	O
and	O
space	O
shooter	O
developed	O
by	O
realtech	B-Application
VR	I-Application
,	O
a	O
Montreal	O
based	O
,	O
French	O
Canadian	O
independent	O
computer	O
games	O
company	O
.	O
</s>
<s>
The	O
game	O
was	O
ported	O
to	O
many	B-Operating_System
platforms	I-Operating_System
over	O
the	O
years	O
as	O
it	O
was	O
open	O
sourced	O
in	O
2005	O
.	O
drew	O
comparisons	O
with	O
the	O
Wing	O
Commander	O
series	O
.	O
</s>
<s>
originates	O
from	O
a	O
late	O
1990s	O
realtech	B-Application
VR	I-Application
BeOS	B-Application
game	O
called	O
,	O
which	O
was	O
later	O
renamed	O
to	O
.	O
</s>
<s>
On	O
February	O
16	O
,	O
2005	O
realtech	B-Application
VR	I-Application
open	O
sourced	O
with	O
the	O
creation	O
of	O
a	O
SourceForge	B-Application
repository	O
.	O
</s>
<s>
The	O
source	O
code	O
and	O
assets	O
of	O
the	O
classic	O
are	O
released	O
under	O
the	O
terms	O
of	O
the	O
GNU	B-License
GPL-2.0-or-later	I-License
,	O
making	O
the	O
game	O
freeware	B-License
and	O
free	B-Application
and	I-Application
open	I-Application
source	I-Application
software	I-Application
.	O
</s>
<s>
The	O
game	O
was	O
made	O
available	O
for	O
Windows	B-Application
XP	I-Application
,	O
AmigaOS	B-Application
,	O
Linux	B-Application
,	O
macOS	B-Application
,	O
and	O
BeOS	B-Application
.	O
</s>
<s>
The	O
game	O
was	O
ported	O
by	O
the	O
community	O
to	O
the	O
PSP	B-Operating_System
.	O
</s>
<s>
In	O
2014	O
a	O
port	O
of	O
the	O
classic	O
version	O
on	O
the	O
OpenPandora	B-Device
handheld	O
followed	O
.	O
</s>
<s>
In	O
2009	O
an	O
extended	O
official	O
PSP	B-Operating_System
port	O
,	O
named	O
No	B-Application
Gravity	I-Application
:	O
The	O
Plague	O
of	O
Mind	O
to	O
differentiate	O
from	O
the	O
"	O
classic	O
"	O
older	O
version	O
,	O
was	O
released	O
.	O
</s>
<s>
In	O
2011	O
an	O
iOS	B-Operating_System
port	O
followed	O
,	O
in	O
2013	O
releases	O
for	O
Windows	B-Operating_System
mobile	I-Operating_System
and	O
OUYA	B-Application
.	O
</s>
<s>
The	O
game	O
was	O
offered	O
by	O
multiple	O
websites	O
as	O
freeware	B-License
download	O
and	O
reviewed	O
several	O
times	O
over	O
the	O
years	O
.	O
</s>
<s>
The	O
classic	O
No	B-Application
Gravity	I-Application
was	O
downloaded	O
alone	O
via	O
SourceForge	B-Application
between	O
2005	O
and	O
May	O
2017	O
over	O
270,000	O
times	O
.	O
</s>
<s>
Metacritic	O
rated	O
the	O
PSP	B-Operating_System
version	O
with	O
65%	O
from	O
eight	O
reviews	O
.	O
</s>
