Free customer relationship management software

Odoo is a business management software suite developed in Belgium. It includes modules for customer relationship management, e-commerce, billing, accounting, manufacturing, warehouse operations, project management, and inventory management.

Compiere (pronounced KOM-pyeh-reh, "to accomplish, complete, fulfill" in Italian) is an open-source ERP and CRM business solution for small and medium-sized enterprises (SME) in distribution, retail, service, and manufacturing. Compiere is distributed by Consona Corporation and through a partner network, who are a collection of trained and authorized business partners.

Dolibarr ERP CRM is an open source, free software package for companies of any size, foundations or freelancers. It includes different features for enterprise resource planning (ERP) and customer relationship management (CRM), and also other features for different activities.

ADempiere is an enterprise resource planning (ERP) software package released under a free software license. The verb adempiere in Italian means "to fulfill a duty" or "to accomplish".

CiviCRM ( C-R-M) is a web-based suite of internationalized open-source software for constituency relationship management that falls under the broad rubric of customer relationship management. It is specifically designed for the needs of non-profit, non-governmental, and advocacy groups, and serves as an association-management system.

ERPNext is a free and open-source integrated enterprise resource planning (ERP) software developed by an Indian software company Frappe Technologies Pvt. Ltd. It is built on the MariaDB database system using Frappe, a Python based server-side framework.

JFire was an enterprise resource planning and customer relationship management system.

Zammad is a free helpdesk or issue tracking system. It offers the connection of various channels like email, chat, telephone, Twitter, or Facebook. Zammad is developed in the programming languages Ruby and JavaScript. The name Zammad comes from the Bavarian language and means "together".