HubSpot CRM - Free CRM software for small businesses.
Clearbit - Clearbit provides Business Intelligence APIs
Keap - Grow Sales. Save Time. Get Organized.
ZoomInfo - ZoomInfo is a B2B database providing detailed business information on people and companies.
Less Annoying CRM - A simple customer relationship manager made just for small businesses. Manage contact info, track leads, and never miss a follow-up.
InsideView - InsideView aggregates and curates all the company and contact data, news and social insights, and professional connections you need to do business better.