SendRecurring - SendRecurring allows you to setup, send, and maintain scheduled email reminders.
Copydue - Top writers, on-demand for as low as $150/mo
Recurrr - Send recurring emails
Mailbutler - Mailbutler adds lacking functionality to email clients and increases your productivity
FollowUpThen - The simplest way to schedule an email reminder
ContentFly - Simple and reliable content ordering platform for busy marketers. Only pre-vetted writers from USA & Canada and 14-day money-back guarantee.