The power user's software dicebag.

But it's quite simple too, if all you want to do is toss a few dice around. Select a hand (1-8), click on dice to add them to that hand, then click Roll 'Em! Command-K clears the selected hand of all dice (a glance at the Edit menu shows you this).

Don't get it? Play around with the app for a minute or two and you will (or read the included comprehensive manual if you're so inclined). Don't want the clutter of extra features? They're all hidden out of the way in the menus anyhow, well-labeled and ready for use but invisible when unneeded. Excellent use of keyboard shortcuts, though I wouldn't be against having the ability to delete dice one-at-a-time from the selected hand in last-to-first order using the delete key.