Mailmeteor - Send hundreds of personalized emails with Gmail.
SendRecurring - SendRecurring allows you to setup, send, and maintain scheduled email reminders.
GMass - GMass allows you to easily schedule emails, send out mass emails and mail merge campaigns and more with Gmail! Click here to learn about more features!
Recurrr - Send recurring emails
Interseller - Interseller helps find contact information, reach out to them with email automation and syncs it all into your database.
FollowUpThen - The simplest way to schedule an email reminder