You could have downloaded BlackClock 1.0 for Mac from our application library for free. This free Mac application was originally designed by DashboardClocks. The program lies within System Tools, more precisely Dashboard Widgets.
From the developer:
BlackClock is an application that lets you get a nice black-colored clock for your Mac OS X dashboard. The program is very easy to install and manage. The elegant appearance of the clock animates your dashboard with the stylish design of a classic analog clock.
You may want to check out more Mac applications, such as iPhotoMini, MIXPOD.com Music Player or KanakaDashboard, which might be related to BlackClock.