ReadNotify - ReadNotify enables the user to know when email is sent and the reciever reads the email.

Komiko - Komiko is a sales intelligence solution to drive sales, retention and expansion.

GetNotify - GetNotify is a free email tracking software solution.

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!

Intelliverse Email Tracker - Intelliverse Email Tracker provides insights to increase the ​productivity of your emails.

mailmark - Send emails and know when they were opened. Keep detaile email logs to who they were sent and when.