ReadNotify - ReadNotify enables the user to know when email is sent and the reciever reads the email.
Mailmeteor - Send hundreds of personalized emails with Gmail.
Intelliverse Email Tracker - Intelliverse Email Tracker provides insights to increase the productivity of your emails.
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!
Komiko - Komiko is a sales intelligence solution to drive sales, retention and expansion.
Email on Acid - We make the send button safer. For every campaign, every message, and every inbox, Email on Acid has the time-saving tools you need to put your best email forward.