Komiko - Komiko is a sales intelligence solution to drive sales, retention and expansion.
Right Inbox - Schedule Emails in Gmail To Be Sent Later
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
mailmark - Send emails and know when they were opened. Keep detaile email logs to who they were sent and when.
FollowUpThen - The simplest way to schedule an email reminder