Open source restaurant ordering system is a software application that allow restaurants to process orders, track inventory, and manage their business. There are two main types of open source restaurant ordering system: 1. Web-based ordering system - these are hosted on a website and can be accessed through a web browser. These systems typically require a user to create an account and enter their credit card information before placing an order. 2. Mobile-based ordering system - these are mobile apps used by customers to place orders from their smartphones or tablets. They allow restaurants to offer the same features as web-based systems with the convenience of a mobile app that can be downloaded for free from the app store or Google Play store.