Sleep Cycle - Bio-alarm clock that wakes you up at optimal times based on your sleep patterns.
Simply Remind Me - Free email and text reminder service so you don't forget the important things in life!
SleepBot - SleepBot is a sleep tracking app available in Google Play and the Apple App Store.
FollowUpThen - The simplest way to schedule an email reminder
Online Alarm Clock - The world's original online alarm clock, established in 2006.
Auto Mail Sender - Auto Mail Sender Standard Edition official page. A powerful and easy-to-use eMail scheduler.