Dialogflow - Conversational UX Platform. (ex API.ai)
Gidi - Gidi is a chatbot that helps you find the perfect gift for any occasion.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
E.L.F - Mall of America's chatbot: Experiential List Formulator
Botpress - Open-source platform for developers to build high-quality digital assistants
YC Gift Ideas - Holiday gift ideas from Y Combinator