LinkedIn Sales Navigator - Sales tool for LinkedIn users.
Zint - Zint is a top-of-the-line sales intelligence platform that makes it easier for businesses to find and track their most important prospects.
Gainful.io - Capture B2B leads on AngelList, CrunchBase and LinkedIn
RampedUp - RampedUp offers data appending, data cleansing and account based selling solutions for Salesforce.com
Clearbit - Clearbit provides Business Intelligence APIs
Growthlead.io - Growth Lead is a B2B social selling tool for Linkedin that helps you scale your outreach.