Adobe Campaign - Adobe Campaign provides campaign, offer, and personalization management capabilities.
SendRecurring - SendRecurring allows you to setup, send, and maintain scheduled email reminders.
Salesforce Journey Builder - Journey Builder empowers you to guide customers on 1:1 journeys across channels and devices to deliver the right digital marketing solution, via the right channel.
Recurrr - Send recurring emails
Acquia Journey - Acquia Journey is an omnichannel tool that allows marketers to listen and learn from customers so they can craft a sequence of personalized touchpoints and trigger what they will see next.
FollowUpThen - The simplest way to schedule an email reminder