Odoo ERP 1. Odoo ERP: This is a true ERP (Enterprise Resource Planning). This means it offers a complete suite of applications (CRM, sales, purchasing, inventory, accounting, project management, manufacturing, human resources, e-commerce, POS, etc.) that are natively integrated and share a single database. This eliminates information silos, automates workflows between departments, and provides a coherent overview of the business. Its modularity is very advanced, allowing you to activate only the applications you need and add more as you grow. 2. Ciel ERP: Historically, Ciel has been geared more toward VSEs/SMEs with specific software (Ciel Compta, Ciel Gestion Commerciale, etc.). While there are integration possibilities between these modules, they are often less seamless and less comprehensive than an integrated ERP solution like Odoo. 3. Sage ERP: Sage offers a very wide range of software, from solutions for small businesses (such as Sage 50c, formerly Ciel) to more complex ERP for large companies (such as Sage X3). Sage also offers modularity, but the integration between its different solutions can be more complex and less "all-in-one" than Odoo, especially for versions intended for small businesses.