LinkedIn Sales Navigator - Sales tool for LinkedIn users.
Elucify - A completely free software tool that uses crowdsourced data to find business email addresses
Gainful.io - Capture B2B leads on AngelList, CrunchBase and LinkedIn
Lead Forensics - B2B website analytics and lead generation.
Clearbit - Clearbit provides Business Intelligence APIs
FindThatLead Prospector - Feed your sales team with daily leads.