"Concerto is a free, Web-based broadcast medium for digital announcements that just works. Using Concerto, it's easy to engage large communities of people with graphical and text-based flyers, alerts, and other messages."
Freeware GUI for Windows Time Service configuration, allowing full control of time sync graphically but still using the Windows sync tools (unlike many tools that do the clock sync and set your clock directly). Works with Windows XP/2003/Vista/2008 32-bit and 64-bit.