SendRecurring - SendRecurring allows you to setup, send, and maintain scheduled email reminders.
Inbox Creature - A super cute virtual pet, delivered right to your inbox.
Recurrr - Send recurring emails
Smartbox by Inbox - The mailbox of tomorrow, today
FollowUpThen - The simplest way to schedule an email reminder
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.