Apps similar to Fossify Clock include Clock (by BlackyHawky), which is free and open source. Other options are Suntimes, Chrono Clock, ClockYou and Free Alarm Clock. There's no shortage of Alarm Clocks like Fossify Clock, with more than 25 alternatives for Android, Mac, Windows, iPhone and the web.
Alarmz is a powerful Windows alarm manager with Outlook-style recurring schedules, text-to-speech, snooze notifications, SMS/email/push alerts, ICS import, 21 languages, dark mode, and more.
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MetaClock is an Online Alarm Clock that can play YouTube videos and uploaded MP3s as an alarm tune. It supports Chromecast which means you can turn your TV or stereo system into an alarm clock. No installation is needed, it can also work offline.
