Elucify - A completely free software tool that uses crowdsourced data to find business email addresses
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
KiteDesk - Use KiteDesk sales prospecting software to generate leads from our premium data marketplace. Then reach prospects and build a sales pipeline with organized Lead Lists. Syncs direct with CRM too!
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
BuiltWith - Find out the technology behind websites
JivoChat - JivoChat is a live chat that enables you to talk to visitors on your website