AnyMailFinder.com - Find anyone's email address
Elucify - A completely free software tool that uses crowdsourced data to find business email addresses
Hunter - Find all the email addresses related to a domain
Lead Forensics - B2B website analytics and lead generation.
AeroLeads - AeroLeads is a lead generation software which finds prospects with email and phone number.
FindThatLead Prospector - Feed your sales team with daily leads.