Yesware - Sell smarter with email tracking and more
Mailtrack.io - The best email tracking solution I've found. Free
Mixmax - At Mixmax, our mission is to change how the world communicates. We’re an email productivity platform that helps sales, customer success, and recruiting teams do their jobs better.
ReadNotify - ReadNotify enables the user to know when email is sent and the reciever reads the email.
FollowUpThen - The simplest way to schedule an email reminder
Bananatag - Find out what happens to your emails after you press send! Add email tracking, attachment tracking, email scheduling and templates to your daily emails.