Jigsaw 365's hook is the fact that it uses a calendar as an interface for its 365 base-level jigsaw puzzles of cute animals, plants, and other appropriately inoffensive scenery. A puzzle a day, get it? Unfortunately, that's just about all it has going for it.
Sure, it's got the usual roster of features found in a PC-based jigsaw puzzler, like the ability to import your own images and break up puzzles into different piece designs and sizes; but nothing about it really stands out, beyond the fact that it gives you its puzzles on a calendar. The number of pieces you can break an image into doesn't go above 200, so those on the hunt for a hardcore challenge aren't going to find it here. If you're a hardcore puzzle enthusiast, Jigsaw 365 might prove a novel choice--but believe it or not, there are better and more interesting jigsaw puzzle programs out there.