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Twenty is a modern, open-source CRM platform focused on providing a fresh user experience with features like customer tracking, opportunity management, and task automation while maintaining complete data ownership.

Krayin CRM is an open-source Laravel-based CRM framework designed for SMEs and enterprises, offering complete customer lifecycle management with features like lead generation, custom attributes, and email integration.

SuiteCRM is an award-winning open-source enterprise CRM platform that provides comprehensive customer relationship management capabilities including sales automation, marketing campaigns, support cases, project management and more.

EspoCRM is an open-source CRM platform designed to help organizations build and maintain strong customer relationships, providing tools for managing leads, contacts, sales opportunities, marketing campaigns, and support cases.

Atomic CRM is a full-featured open-source CRM built with React, react-admin, and Supabase, offering contact management, task tracking, email integration, deal pipeline visualization and extensive customization capabilities.

Django-CRM is an open-source CRM solution built on Django framework, providing enterprise-level features like lead management, task tracking, email marketing, and sales analytics while maintaining simplicity in development and customization.