<s>
In	O
free	B-Application
software	I-Application
,	O
Zeitgeist	B-Language
is	O
a	O
software	O
service	O
which	O
logs	O
the	O
users	O
's	O
activities	O
and	O
events	O
,	O
anywhere	O
from	O
files	O
opened	O
to	O
websites	O
visited	O
and	O
conversations	O
.	O
</s>
<s>
It	O
is	O
able	O
to	O
establish	O
relationships	O
between	O
items	O
based	O
on	O
similarity	O
and	O
usage	O
patterns	O
by	O
applying	O
data	O
association	O
algorithms	O
such	O
as	O
"	O
Winepi	B-Algorithm
"	O
and	O
"	O
Apriori	B-Algorithm
"	O
.	O
</s>
<s>
Zeitgeist	B-Language
is	O
the	O
main	O
engine	O
and	O
logic	O
behind	O
GNOME	B-Language
Activity	I-Language
Journal	I-Language
which	O
is	O
currently	O
seen	O
to	O
become	O
one	O
of	O
the	O
main	O
means	O
of	O
viewing	O
and	O
managing	O
activities	O
in	O
GNOME	B-Application
version	O
3.0	O
.	O
</s>
<s>
Zeitgeist	B-Language
currently	O
logs	O
file	O
usage	O
,	O
web	O
activity	O
,	O
plus	O
chat	O
and	O
email	O
conversations	O
.	O
</s>
<s>
Zeitgeist	B-Language
allows	O
any	O
application	O
to	O
store	O
this	O
information	O
and	O
makes	O
it	O
readily	O
available	O
over	O
a	O
DBus	B-Language
API	O
.	O
</s>
<s>
Zeitgeist	B-Language
figures	O
out	O
which	O
are	O
a	O
user	O
’s	O
most	O
used	O
items	O
,	O
not	O
only	O
in	O
general	O
,	O
but	O
also	O
applying	O
time	O
scoping	O
as	O
in	O
“	O
What	O
was	O
most	O
relevant	O
to	O
me	O
,	O
while	O
I	O
was	O
working	O
on	O
project	O
X	O
,	O
for	O
a	O
month	O
last	O
year	O
?	O
”	O
.	O
</s>
<s>
Using	O
machine-learning	O
algorithms	O
,	O
Zeitgeist	B-Language
can	O
establish	O
relationships	O
between	O
items	O
based	O
on	O
similarity	O
and	O
usage	O
patterns	O
.	O
</s>
<s>
Zeitgeist	B-Language
is	O
light-weight	O
and	O
supports	O
extensions	O
to	O
enhance	O
its	O
engine	O
’s	O
core	O
feature	O
set	O
.	O
</s>
