Institutions and organizations can choose to install the Dataverse Network software for their own use. In this case, the institution will be responsible for maintaining the application; installing upgrades, setting up backups and data replication as needed.
The Dataverse Network code is open-source and free.
Download the latest version of the Dataverse Network.
All previous versions are available here.
Dataverse Network code base stats are available here on Ohloh.