HubSpot CRM - Free CRM software for small businesses.
Cloze - Smarter Relationship Management
Keap - Grow Sales. Save Time. Get Organized.
Propeller CRM - Small business CRM with deep Gmail integration
Less Annoying CRM - A simple customer relationship manager made just for small businesses. Manage contact info, track leads, and never miss a follow-up.
Streak - Manage customers inside Gmail