InStream CRM - Business relationship management platform - CRM alternative
HubSpot CRM - Free CRM software for small businesses.
Gmail CoPilot by cloudHQ - Easy CRM: View all past conversations with an email contact
Less Annoying CRM - A simple customer relationship manager made just for small businesses. Manage contact info, track leads, and never miss a follow-up.
Crmble - Easy peasy crm for Trello
Keap - Grow Sales. Save Time. Get Organized.