Gainful.io - Capture B2B leads on AngelList, CrunchBase and LinkedIn
Hunter - Find all the email addresses related to a domain
Prospect Stack - 100 ways to generate more prospects
Snov.io - More leads. More sales. More revenue.
Sales List by Prospect.io - A curated list of tools & resources for salespeople
Apollo.io - Apollo’s predictive prospecting, sales engagement, and actionable analytics help the teams to reach its full revenue potential.