Dr. Rolf Jansen’s little clock app for OS X is pretty much a one-trick pony, but it is also just plain pretty.
The Clock is simply a ticker clock that displays the current time and moves its hands in a seconds cycle.
It also updates its Dock icon with the current time, and ticks very gently when the clock window is open. You can hide the clock window from the Clock menu to silence the clock.
I think the Clock is cool, but I would like it even better if its window were resizable. The default and only size is pretty imposing, especially on a 13.3-inch MacBook 1,280 x 800 resolution display. It would be great if one could shrink it down (a lot) and park it in a lower traffic corner of the screen to monitor the time.
However, even non-resizable it’s a worthwhile download, since it’s free and useful even if you’re obliged to leave it in the Dock most of the time and squint (enabling magnification on mouse over helps).
Clock also makes modest system preferences demands, and supports back as far as OS X 10.5 Leopard. It also requires a 64-bit processor.
Clock is freeware, and is available in the Mac App Store.