<s>
Rainlendar	B-Language
is	O
a	O
calendar	B-Application
program	I-Application
for	O
Windows	B-Application
,	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
and	O
Linux	B-Application
.	O
</s>
<s>
Versions	O
prior	O
to	O
version	O
2	O
are	O
licensed	O
under	O
the	O
GNU	B-License
GPL	I-License
as	O
free	B-Application
software	I-Application
,	O
but	O
subsequent	O
versions	O
are	O
proprietary	B-Application
shareware	B-License
.	O
</s>
<s>
Rainlendar	B-Language
is	O
characterized	O
by	O
very	O
small	O
space	O
and	O
memory	O
requirements	O
,	O
stability	O
,	O
and	O
an	O
easily	O
customizable	O
user-interface	O
(	O
using	O
skins	B-Application
)	O
.	O
</s>
<s>
The	O
calendar	B-Application
can	O
be	O
transparently	O
placed	O
on	O
the	O
desktop	O
and	O
can	O
be	O
managed	O
using	O
the	O
Windows	B-Application
notification	O
area	O
.	O
</s>
<s>
Calendars	B-Application
can	O
also	O
be	O
imported	O
or	O
synchronized	O
using	O
common	O
file	O
formats	O
such	O
as	O
Outlook	B-Application
,	O
iCal	B-Language
and	O
iCalendar	O
files	O
(	O
using	O
a	O
plugin	O
)	O
.	O
</s>
<s>
In	O
addition	O
to	O
the	O
stand-alone	O
calendar	B-Application
program	I-Application
,	O
a	O
Rainlendar-server	O
is	O
available	O
for	O
Windows	B-Application
and	O
Linux	B-Application
,	O
which	O
can	O
synchronize	O
distributed	O
Rainlendar	B-Language
applications	O
.	O
</s>
<s>
Rainlendar	B-Language
is	O
available	O
as	O
of	O
2016	O
in	O
about	O
60	O
languages	O
(	O
via	O
language	O
packs	O
)	O
,	O
and	O
thousands	O
of	O
individual	O
skin	O
designs	O
.	O
</s>
<s>
Alternatives	O
to	O
Rainlendar	B-Language
include	O
Korganizer	O
,	O
the	O
GNOME	B-Application
calendar	B-Application
(	O
both	O
for	O
Linux	B-Application
)	O
and	O
Lightning	B-Language
.	O
</s>
