Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Unlimited Email Tracker - Track opens and clicks, set reminders and delays in Gmail
HelpDocs - Educate your users with a super simple knowledge base that’s built for teams just like yours.
Mailtrack.io - The best email tracking solution I've found. Free
ScribeHow - Create step-by-step user guides, with a simple click
EmailTrackerPro - EmailTrackerPro is an email tracking and spam filter solution.