Open source CRM software is software that anyone can use and customize for free. It helps businesses stay in touch with their customers, and improve sales and marketing processes. Open source CRM systems like SuiteCRM, Odoo CRM, and Krayin CRM are quite popular. This CRM software allows companies to add and customize modules according to their business processes. The biggest feature of open source CRM is that it reduces costs and can be changed according to the needs of the company.