Atomic CRM is free and open-source. You can test it online at https://marmelab.com/atomic-crm-demo.

Features
📇 Organize Contacts: Keep all your contacts in one easily accessible place.
⏰ Create Tasks & Set Reminders: Never miss a follow-up or deadline.
📝 Take Notes: Capture important details and insights effortlessly.
✉️ Capture Emails: CC Atomic CRM to automatically save communications as notes.
📊 Manage Deals: Visualize and track your sales pipeline in a Kanban board.
🔄 Import & Export Data: Easily transfer contacts in and out of the system.
🔐 Control Access: Log in with Google, Azure, Keycloak, and Auth0.
📜 Track Activity History: View all interactions in aggregated activity logs.
🔗 Integrate via API: Connect seamlessly with other systems using our API.
🛠️ Customize Everything: Add custom fields, change the theme, and replace any component to fit your needs.