SendRecurring - SendRecurring allows you to setup, send, and maintain scheduled email reminders.
Acuity Scheduling - Automate your client bookings, cancellations, reminders & payments using the worlds friendliest online scheduling software.
Recurrr - Send recurring emails
BookSteam - BookSteam Online booking and appointment scheduling software for businesses worldwide. Easy to use, cloud based web scheduler that includes class and group bookings. Calendar management and schedule organization, trusted by thousands.
FollowUpThen - The simplest way to schedule an email reminder
MINDBODY - Find and book fitness and beauty classes near you.