ConceptBase by Roberto Zicari · Published January 1, 2008 · Updated February 16, 2014 Tilburg University ConceptBase is a multi-user deductive and object-oriented database system for meta modeling and method engineering (FreeBSD-style license) LINK
GLASS a free ODBMS for the Seaside web framework January 1, 2009 by Roberto Zicari · Published January 1, 2009 · Last modified February 16, 2014
EyeDB Object Oriented Database Management System January 1, 2009 by Roberto Zicari · Published January 1, 2009 · Last modified February 16, 2014
McObject January 1, 2009 by Roberto Zicari · Published January 1, 2009 · Last modified February 16, 2014