RGB Technologies - Email Scheduler - Email Scheduler provides an intuitive email scheduling solution, integrated within the existing Salesforce account.
Right Inbox - Schedule Emails in Gmail To Be Sent Later
Seventh Sense - Seventh Sense helps marketers and sales professionals reach the people that make them successful using artificial intelligence powered email.
The Top Inbox - The Top Inbox for Gmail helps to schedule emails to be sent later, set reminders in the inbox and follow up with email sequences.
EmailPlayground - EmailPlayground provides solution to schedule and send emails with ease.
SendLater - Email scheduler for Mac Mail.