Mailtrack.io - The best email tracking solution I've found. Free
ScreenCloud - ScreenCloud is a simple, cloud-based Digital Signage software solution that makes it easy to display video, images and content on screens.
ReadNotify - ReadNotify enables the user to know when email is sent and the reciever reads the email.
Embed Signage - Multi-platform Digital Signage Software that's quick to learn and powerful to use. Packed with features, simple to use and wide range of device platform support. A better way to manage your Digital Signage.
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.
PDComms Tool - Digital Signage