Elucify - A completely free software tool that uses crowdsourced data to find business email addresses
eTrigue - Real-time Sales Acceleration & Marketing Automation Solution
Lead Forensics - B2B website analytics and lead generation.
BuiltWith - Find out the technology behind websites
FindThatLead Prospector - Feed your sales team with daily leads.
Prospect.io - Prospecting, like a boss. Find any email, reach out, measure everything and integrate with your CRM.