Beersmith actually does have a calendar in it. If you go to the menu bar, under 'view', you should see a calendar that you can look at. It will automatically add fermentation, bottling and conditioning dates as you set them in the recipe, its a little know feature, but it is always there. As far as I know, Beersmith doesn't have a log for keeping an inventory of the beers you have, it does ingredients, but not actual beers. But, I could be wrong, as I've never looked for that feature either.
Draft 3: Belgian Dubbel
Primary 1: German Hefe