Odoo is one of the most used open source solution in the world. It is a comprehensive suite of business applications including Sales, CRM, Project management, Warehouse management, Manufacturing, Financial management, and Human Resources just to name a few. Odoo offers a choice of over a thousand modules. Odoo is available in the cloud or on-site and is most suited for small to mid-sized companies. With more than a thousand downloads/installations per day, It has a dynamic community, is flexible, and can be adapted to your needs. It can be put in production rapidly thanks to its modularity and is easy to use.