This document summarizes a presentation about developing conversational AI using open source technologies. It discusses using the open source Tock kit to build conversational assistants, including OuiBot which is used by Oui.sncf customers. Tock allows building assistants that can operate across multiple channels like messaging, voice and smart displays. The presentation shares the company's experience and convictions about using open source to promote innovation, agility, skills sharing and data ownership while developing conversational AI technologies.