Clearbit - Clearbit provides Business Intelligence APIs
SoPro - B2B Lead Generation - Flood Your Inbox With Qualified Leads
ZoomInfo - ZoomInfo is a B2B database providing detailed business information on people and companies.
MailChimp - MailChimp is the best way to design, send, and share email newsletters.
InsideView - InsideView aggregates and curates all the company and contact data, news and social insights, and professional connections you need to do business better.
Marketo - Marketo's powerful marketing automation software helps marketers master the art & science of digital marketing to engage customers and prospects.