Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.

Komiko - Komiko is a sales intelligence solution to drive sales, retention and expansion.

tawk.to - tawk.to is a free live chat app that lets you monitor and chat with visitors on your website or from a free customizable page

GMass - GMass allows you to easily schedule emails, send out mass emails and mail merge campaigns and more with Gmail! Click here to learn about more features!

Zendesk - Zendesk is a beautiful, lightweight help-desk solution.

mailmark - Send emails and know when they were opened. Keep detaile email logs to who they were sent and when.