AeroLeads - AeroLeads is a lead generation software which finds prospects with email and phone number.
6sense - 6sense is a B2B predictive intelligence engine for marketing and sales.
Hunter - Find all the email addresses related to a domain
Leadiro - Seriously Smart & Live B2B Data
ZoomInfo - ZoomInfo is a B2B database providing detailed business information on people and companies.
LeadFuze - B2B Lead Generation & Sales Prospecting Software.