Espocrm

EspoCRM is an open-source CRM web application for storing, organizing, and managing leads, contacts, sales opportunities, marketing campaigns, support cases, and other business information. Its single-page frontend provides a documented user interface, while a PHP backend exposes a REST API.

The system supports customization through custom entities, fields, relationships, buttons, and extensions. It is intended for organizations seeking a free or on-premise CRM and can be downloaded and installed manually, by script, or with Docker. Supported databases include MySQL, MariaDB, and PostgreSQL.