Leadfeeder - Leadfeeder converts your website visitors into sales. Connect your website's Google Analytics to Leadfeeder and unlock the power of seeing who`s visiting your site!
V12 Data - V12 Data offers rich data sets with verified addresses and emails for personalized marketing campaigns.
Visitor Queue - Better identify the companies that visited your website!
Adobe Audience Manager - Adobe Audience Manager is a data management platform that integrates online and offline data to deliver a unified view of all your audiences
Elucify - A completely free software tool that uses crowdsourced data to find business email addresses
Google Audience Center - 3 votes and 6 comments so far on Reddit