There are many tools that can be use to streamline collaboration in our international projects. There are only a few such packahes provided by the University as GDPR compliant tools. These tools are described here
In addition the Faculty is currently in the process of acquiring a license for the Overleaf tool for writing Latex documents.
Leiden Observatory is currently in the process of acquiring a license for the Slack tool
All other tools are non-GDPR compliant.