<s>
The	O
Tango	B-Language
Desktop	I-Language
Project	I-Language
was	O
an	O
open-source	B-Application
initiative	O
to	O
create	O
a	O
set	O
of	O
design	O
guidelines	O
and	O
to	O
provide	O
a	O
consistent	O
user	B-Application
experience	I-Application
for	O
applications	O
on	O
desktop	O
environments	O
.	O
</s>
<s>
The	O
project	O
created	O
a	O
set	O
of	O
icons	O
known	O
as	O
the	O
Tango	B-Language
Icon	I-Language
Library	I-Language
and	O
that	O
were	O
described	O
as	O
a	O
"	O
proof	O
of	O
concept	O
"	O
.	O
</s>
<s>
The	O
Tango	B-Language
Desktop	I-Language
Project	I-Language
was	O
a	O
project	O
of	O
freedesktop.org,	O
and	O
was	O
closely	O
linked	O
with	O
other	O
freedesktop.org	B-Application
guidelines	O
,	O
such	O
as	O
the	O
Standard	O
Icon	O
Theming	O
Specification	O
.	O
</s>
<s>
The	O
visual	O
inconsistencies	O
that	O
arise	O
from	O
different	O
desktop	O
environments	O
(	O
such	O
as	O
KDE	B-Application
,	O
GNOME	B-Application
,	O
or	O
Xfce	B-Language
)	O
and	O
custom	O
distributions	O
make	O
it	O
hard	O
for	O
third	O
parties	O
to	O
target	O
Linux	B-Application
.	O
</s>
<s>
Ideally	O
,	O
any	O
project	O
that	O
follows	O
the	O
Tango	O
guidelines	O
will	O
have	O
a	O
look	B-Application
and	I-Application
feel	I-Application
that	O
matches	O
well	O
with	O
other	O
icons	O
and	O
applications	O
that	O
follow	O
the	O
guidelines	O
.	O
</s>
<s>
Instead	O
,	O
a	O
secondary	O
aim	O
of	O
the	O
project	O
was	O
to	O
create	O
a	O
standard	O
style	O
that	O
makes	O
applications	O
look	O
appropriate	O
running	O
on	O
operating	O
systems	O
common	O
at	O
that	O
time	O
,	O
such	O
that	O
independent	B-Application
software	I-Application
vendors	I-Application
would	O
find	O
that	O
their	O
application	O
did	O
not	O
look	O
out	O
of	O
place	O
on	O
Windows	B-Application
XP	I-Application
,	O
Mac	B-Application
OS	I-Application
X	I-Application
,	O
KDE	B-Application
,	O
GNOME	B-Application
,	O
or	O
Xfce	B-Language
.	O
</s>
<s>
Tango	O
followed	O
the	O
org	O
's	O
Standard	O
Icon	O
Theming	O
Specification	O
and	O
actively	O
developed	O
the	O
org	O
's	O
Standard	O
Icon	O
Naming	O
Specification	O
,	O
defining	O
names	O
for	O
the	O
most	O
common	O
icons	O
and	O
the	O
used	O
metaphors	O
.	O
</s>
<s>
Many	O
free	O
software	O
projects	O
,	O
such	O
as	O
GIMP	B-Application
,	O
Scribus	B-Application
,	O
and	O
GNOME	B-Application
,	O
have	O
started	O
to	O
follow	O
the	O
Tango	O
style	O
guidelines	O
for	O
their	O
icons	O
.	O
</s>
<s>
Also	O
,	O
ReactOS	B-Application
uses	O
Tango	B-Language
icons	I-Language
,	O
as	O
does	O
Mozilla	B-Language
Firefox	I-Language
3	I-Language
when	O
it	O
is	O
unable	O
to	O
find	O
the	O
user	O
's	O
installed	O
icon	O
set	O
or	O
for	O
icons	O
not	O
covered	O
by	O
said	O
icon	O
set	O
.	O
</s>
<s>
It	O
is	O
also	O
possible	O
for	O
proprietary	O
closed-source	O
applications	O
to	O
use	O
Tango	B-Language
Desktop	I-Language
Project	I-Language
icons	O
.	O
</s>
<s>
Examples	O
highlighted	O
by	O
the	O
Tango	O
Showroom	O
include	O
VMware	B-Operating_System
Workstation	I-Operating_System
6	O
and	O
Medsphere	O
OpenVista	O
CIS	O
.	O
</s>
<s>
The	O
Tango	B-Language
icons	I-Language
were	O
originally	O
released	O
under	O
a	O
copyleft	B-License
Creative	O
Commons	O
license	O
(	O
Attribution-ShareAlike	O
)	O
,	O
but	O
were	O
released	O
into	O
the	O
public	O
domain	O
in	O
2009	O
in	O
order	O
to	O
make	O
it	O
easier	O
to	O
reuse	O
them	O
.	O
</s>
<s>
This	O
is	O
the	O
hexadecimal	O
color	O
palette	B-Data_Structure
used	O
by	O
the	O
Tango	B-Language
Desktop	I-Language
Project	I-Language
,	O
organized	O
by	O
color	O
group	O
and	O
brightness	O
:	O
</s>
