Right Inbox - Schedule Emails in Gmail To Be Sent Later
SendRecurring - SendRecurring allows you to setup, send, and maintain scheduled email reminders.
SndLatr - SndLatr is a Gmail plugin that makes it easy to schedule emails to be sent automatically at a later time.
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!
Brevo - Innovative online Email Marketing solution to manage your contacts, create & send your newsletters and track your results. More than 80 000 clients. Best prices and attractive features.
EmailPlayground - EmailPlayground provides solution to schedule and send emails with ease.