Software and Computer System Company (SCSC) has released ClearTime for Mac OS X (http://scsc-online.com/ClearTime.html). It’s a configurable clock and alarm system designed to provide computer users with a more obvious and configurable alarm and clock monitor than those found with standard Mac apps.
ClearTime features a fully configurable clock with user configurable sizes and colors, and alarms that can be configured to use built in sounds or user selected audio tracks.
ClearTime is available for Intel systems only, but it still supports the older operating system versions like Snow Leopard, right up through the latest version of OS X, El Capitan. It costs US$14.95.