<s>
Apper	B-Language
(	O
originally	O
named	O
KPackageKit	B-Language
)	O
is	O
a	O
free	B-Application
and	O
open	B-Application
source	I-Application
Linux	B-Application
front-end	O
application	O
for	O
the	O
PackageKit	B-Language
package	B-Application
management	I-Application
service	O
by	O
KDE	B-Application
.	O
</s>
<s>
Apper	B-Language
also	O
has	O
one	O
main	O
difference	O
compared	O
to	O
the	O
old	O
KPackageKit	B-Language
:	O
Apper	B-Language
can	O
list	O
applications	O
instead	O
of	O
listing	O
only	O
packages	O
.	O
</s>
<s>
It	O
can	O
be	O
compared	O
to	O
the	O
Ubuntu	B-Language
Software	I-Language
Center	I-Language
as	O
well	O
as	O
the	O
AppStream	B-Application
project	O
.	O
</s>
<s>
Apper	B-Language
has	O
been	O
adopted	O
by	O
a	O
few	O
distributions	O
such	O
as	O
Fedora	O
,	O
Debian	O
and	O
openSUSE	B-Operating_System
12.1	O
.	O
</s>
