CONGA is a MDE solution to implement chatbots. It consists of:
Model driven Chatbot Development. 2020. Sara Perez-Soler, Esther Guerra, Juan de Lara. 39th International Conference on Conceptual Modelling (ER'2020), (Virtual) Springer [PDF]
Creating and Migrating Chatbots with CONGA. 2021. Sara Perez-Soler, Esther Guerra, Juan de Lara. 43rd International Conference on Software Engineering (ICSE'2021), Demostration [PDF]