Odoo offers three separate versions of the solution; Odoo Enterprise, Odoo Online SaaS (Software as a Service) version, and the Odoo Community version. The Enterprise version is self hosted, and it includes all the apps. The Odoo Online version is hosted on a cloud.
The Community version is the open source version. The Source code for the OpenObject framework and core ERP (enterprise resource planning) modules is curated by the Belgium-based Odoo S.A. The last fully featured Open Source version was 8.0 (LTS), available on GitHub under AGPLv3.Odoo is the most popular open source ERP system.
Odoo is an all-in-one business software capable of covering all business needs, including CRM, Website/e-Commerce, billing, accounting, manufacturing, warehouse- and project management, and inventory, all seamlessly integrated.