Power Alarm Clock - Free VS Neon Alarm Clock

Pester - Pester: simple, disposable alarms and timers for macOS

Free Alarm Clock - Free Alarm Clock is a free, full-featured and user-friendly computer alarm clock for Windows.

AlarmDJ - Online Alarm Clock - Use YouTube videos or MP3 files as alarm sound. Works offline.

Digital Clock 4 - Beautiful customizable clock with plugins

Task Scheduler - The Task Scheduler enables you to automatically perform routine tasks on a chosen computer. Task Scheduler does this by monitoring whatever criteria you choose (referred to as triggers) and then executing the tasks when their criteria are met.

My Own Clock - Wooden gear clocks, clock kits, and do-it-yourself clock plans. These original all-wood clocks are functional, attractive, and fun!