LevelEleven - LevelEleven is a sales performance optimization platform.
Mailtrack.io - The best email tracking solution I've found. Free
Spinify - Sales gamification to motivate, engage and celebrate your teams performance.
ReadNotify - ReadNotify enables the user to know when email is sent and the reciever reads the email.
Outreach - Outreach Is Your Sales Communication Platform
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.