Clearbit - Clearbit provides Business Intelligence APIs
Callmama - Get cheap international calling, international virtual number, Call Mama Gives an added advantage to send message and make calls to non-user of Callmama App.
ZoomInfo - ZoomInfo is a B2B database providing detailed business information on people and companies.
CallHippo - Easy to use Phone System with World-Class Support
InsideView - InsideView aggregates and curates all the company and contact data, news and social insights, and professional connections you need to do business better.
KrispCall - Virtual cloud phone system for business