McObject by Roberto Zicari · Published January 1, 2009 · Updated February 16, 2014 Download an open source / evaluation copy of the Perst™ embedded database for Java or .NET. LINK
ConceptBase January 1, 2008 by Roberto Zicari · Published January 1, 2008 · Last modified February 16, 2014
Perst. Open Source, Object-Oriented Embedded Database January 1, 2009 by Roberto Zicari · Published January 1, 2009 · Last modified March 12, 2019
The Open Source Database Benchmark January 1, 2005 by Roberto Zicari · Published January 1, 2005 · Last modified February 16, 2014