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
eXTreme Java framework January 1, 2010 by Roberto Zicari · Published January 1, 2010 · Last modified February 16, 2014
Caché Post-relational Database January 1, 2010 by Roberto Zicari · Published January 1, 2010 · Last modified May 9, 2014
The Open Source Database Benchmark January 1, 2005 by Roberto Zicari · Published January 1, 2005 · Last modified February 16, 2014