Sharing descriptive metadata is the first essential step towards the so-called “Open Data” approach. With this in mind, the Maggot tool was specially designed to allow users to easily add descriptive metadata to datasets produced within a collective (research unit, platform, multi-partner project, etc.) while fitting perfectly into a structuring data management plan. Indeed, this approach addresses the issues of data organization and documentation, data storage and metadata sharing within this same collective and beyond.