Clearbit - Clearbit provides Business Intelligence APIs
6sense - 6sense is a B2B predictive intelligence engine for marketing and sales.
DataXu - Marketing analytics for brands and agencies.
LeadIQ - VP of Sales. Every second in sales counts. You hired your sales team to sell, not do data entry. LeadIQ will pump up your sales team with accurate prospect data and a smooth workflow so you can fill up your pipeline faster.
V12 Data - V12 Data offers rich data sets with verified addresses and emails for personalized marketing campaigns.
LeadFuze - B2B Lead Generation & Sales Prospecting Software.