Digital Clock 4 - Beautiful customizable clock with plugins
Gnome Clocks - Clock application designed for GNOME 3
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.
Simple Calendar - A simple calendar with events (optional recurring and reminders), week numbers and a customizable...
KTimer - KTimer is a little tool to execute programs after some time.