Odoo is an all-in-one business management suite of mobile-friendly web apps that integrates everything you need to grow your business: CRM, website content management, project management, human resources, accounting, invoicing and more. Odoo apps integrate seamlessly to provide a full-featured open source ERP, but can also be used stand-alone. Python programmers can develop their own app modules, or choose from an array of free open source such as those provided by OCA; or paid commercial ones.