ownCloud - ownCloud is an open source project enabling businesses to host their own cloud storage while maintaining regulatory and compliance needs.
DSpace - DSpace open source software enables open sharing of content that spans organizations, continents...
Invenio - Invenio is a free, open-source software to run a digital library or document repository on the web.
Radicale - The Radicale Project is a complete CalDAV (calendar) and CardDAV (contact) server solution.
Evergreen ILS - Evergreen - Open Source Library Software
BitKeeper - BitKeeper is an open source distributed version control tool.