Anyone know of a calendar software compatible between Mac and Windows?

Hi guys,

I have a friend who needs to create a calendar template with an image up top that can be edited on both Mac and PC.

I could have swore there was a freeware program that I used to do something similar years ago but I can't seem to find it. Does anyone know of a program that would do this?

Oops offline Calendar to be printed. Sorry for not clarifying!

Oh thats weird I don't know how I missed the other suggestions. Thanks guys!