SendRecurring - SendRecurring allows you to setup, send, and maintain scheduled email reminders.
Sales Creatio - Out-of-the-box processes to close more deals
Recurrr - Send recurring emails
Taimer - Taimer is a PSA solution designed for service companies to reduce the hassle in their work, get paid quickly, and sell more.
FollowUpThen - The simplest way to schedule an email reminder
Vtenext - Vtenext is a platform that allows you to tackle CRM processes and customers with great ease.