Some well-reviewed free PC alarm clock programs include the browser-based OnlineClock.net and the downloadable Free Alarm Clock by Comfort Software. Both programs offer an array of customizable features and a minimalist interface.
OnlineClock.net offers an assortment of animated backgrounds, including a fireplace and an aquarium. It also offers alarm sounds, including a crying baby and a military trumpet, in addition to a clock-radio feature that includes different genres of music.
Free Alarm Clock includes options to wake to the computer from sleep mode or turn on the monitor. It also offers customized repeatable alarms depending on the day of the week, which can include written reminder notes.