Komiko - Komiko is a sales intelligence solution to drive sales, retention and expansion.
ReadNotify - ReadNotify enables the user to know when email is sent and the reciever reads the email.
Outreach - Outreach Is Your Sales Communication Platform
Intelliverse Email Tracker - Intelliverse Email Tracker provides insights to increase the productivity of your emails.
Yesware - Sell smarter with email tracking and more
SalesLoft - The simpliest way to build the most accurate and targeted lists of leads on the internet