Reminduck - A simple reminder app made for elementaryOS with Vala and GTK. - matfantinel/reminduck
Free Alarm Clock - Free Alarm Clock is a free, full-featured and user-friendly computer alarm clock for Windows.
Holiline Reminder - Holiline Reminder is both an event reminder and a calendar.
Gnome Clocks - Clock application designed for GNOME 3
024h Lucky Reminder - 024h Lucky Reminder is a reminder software for home and office.
AlarmDJ - Online Alarm Clock - Use YouTube videos or MP3 files as alarm sound. Works offline.