Website: https://www.espocrm.com/
Source Code: https://github.com/espocrm/espocrm
"EspoCRM is a free, open-source CRM platform designed to help organizations build and maintain strong customer relationships. It provides a wide range of tools to store, organize, and manage leads, contacts, sales opportunities, marketing campaigns, support cases, and more - all business information in a simple and intuitive interface."