CommonSpaces is structured in online communities and projects. Below is a list of the existent communities and of their child projects.
A project can be created only inside a community. However, most projects are open, in the sense that to join the project it is not required to be member of the parent community.
Membership in some CommonSpaces communities is restricted to people known to already belong to the matching real-world community; for example, only students or teachers of the "Sapienza" university can be accepted as members of the online community "Sapienza. University of Rome 1".