Sumo - Free tools to grow your email list.
Elucify - A completely free software tool that uses crowdsourced data to find business email addresses
OptinMonster - OptinMonster helps to convert abandoning website visitors into subscribers and customers.
Lead Forensics - B2B website analytics and lead generation.
OptiMonk - OptiMonk is the most powerful Onsite Retargeting platform, that helps you increase the conversion rate of your site, and get more leads by recovering lost visitors.
FindThatLead Prospector - Feed your sales team with daily leads.