Right Inbox - Schedule Emails in Gmail To Be Sent Later
ClocX - ClocX - freeware analog clock for Windows desktop with many features like calendar, alarms, skins, antialiasing and transparency.
Recurrr - Send recurring emails
AlarmDJ - Online Alarm Clock - Use YouTube videos or MP3 files as alarm sound. Works offline.
FollowUpThen - The simplest way to schedule an email reminder
DS Clock - Keep your time synchronized with Atomic Time servers, using customizable digital desktop clock with westminster chimes.