This paper describes the data management in multilingual lexical databases. Since NLP systems are using lexical data, the amount of work to build them is huge. That is the reason why it is important to use rigorous powerful systems and to be able to get data for a minimal cost. As an open source project, Papillon is reusing existing lexical data and wants to make volunteers collaborate. To make it possible, it combines state of the art concepts in the field of linguistic and computing.