<s>
The	O
Harmony	B-Library
toolkit	I-Library
is	O
a	O
never-completed	O
free	B-Application
software	I-Application
widget	B-Library
toolkit	I-Library
that	O
aimed	O
to	O
be	O
API	B-Application
compatible	O
with	O
the	O
then	O
non-freely	O
licensed	O
Qt	B-Language
widget	B-Library
toolkit	I-Library
.	O
</s>
<s>
The	O
QPL	O
license	O
that	O
Qt	B-Language
used	O
was	O
free	O
only	O
if	O
the	O
program	O
was	O
not	O
sold	O
for	O
profit	O
and	O
if	O
its	O
source	O
code	O
was	O
freely	B-Application
available	O
.	O
</s>
<s>
It	O
was	O
later	O
released	O
under	O
the	O
terms	O
of	O
the	O
GNU	B-Application
Lesser	I-Application
General	I-Application
Public	I-Application
License	I-Application
(	O
LGPL	B-Application
)	O
.	O
</s>
<s>
In	O
addition	O
to	O
source	O
compatibility	O
with	O
Qt	B-Language
,	O
the	O
Harmony	B-Library
project	O
also	O
aimed	O
to	O
add	O
functionality	O
such	O
as	O
multi-threaded	B-Operating_System
applications	O
and	O
pluggable	O
themes	O
,	O
features	O
that	O
Qt	B-Language
itself	O
later	O
added	O
.	O
</s>
<s>
The	B-Application
GNU	I-Application
Project	I-Application
launched	O
the	O
Harmony	B-Library
project	O
,	O
and	O
also	O
the	O
GNOME	B-Application
desktop	I-Application
project	O
,	O
to	O
counter	O
the	O
perceived	O
problem	O
that	O
the	O
free	B-Application
software	I-Application
KDE	B-Application
desktop	O
was	O
gaining	O
popularity	O
but	O
was	O
requiring	O
that	O
people	O
install	O
proprietary	B-Application
software	I-Application
.	O
</s>
<s>
In	O
July	O
1997	O
the	B-Application
GNU	I-Application
Project	I-Application
called	O
for	O
volunteers	O
for	O
a	O
Qt	B-Language
replacement	O
in	O
GNU	O
's	O
Bulletin	O
and	O
listed	O
it	O
as	O
a	O
top	O
priority	O
task	O
on	O
its	O
website	O
.	O
</s>
<s>
Development	O
ceased	O
at	O
the	O
end	O
of	O
2000	O
,	O
when	O
Qt	B-Language
was	O
released	O
under	O
the	O
GPL	B-License
,	O
removing	O
the	O
perceived	O
need	O
for	O
the	O
Harmony	B-Library
Project	O
to	O
exist	O
.	O
</s>
<s>
In	O
January	O
2009	O
Qt	B-Language
itself	O
was	O
made	O
available	O
under	O
the	O
GNU	B-Application
LGPL	I-Application
,	O
along	O
with	O
the	O
previous	O
license	O
options	O
.	O
</s>
