Free Alarm Clock - Free Alarm Clock is a free, full-featured and user-friendly computer alarm clock for Windows.
Digital Clock 4 - Beautiful customizable clock with plugins
Gnome Clocks - Clock application designed for GNOME 3
Simple Calendar - A simple calendar with events (optional recurring and reminders), week numbers and a customizable...
KClock Clock - Universal clock application for desktop and mobile Linux
Simple Alarm Clock - Simple open source alarm application for Android devices.