Memcached by Roberto Zicari · Published January 1, 2011 · Updated February 16, 2014 Free & open source, high-performance, distributed memory object caching system. LINK
TOKUMX V2.0 October 1, 2014 by Roberto Zicari · Published October 1, 2014 · Last modified February 12, 2015
Download kdb+ (32-bit version) for free February 19, 2016 by Roberto Zicari · Published February 19, 2016
db4o as Storage Provider in Voldemort September 1, 2010 by Roberto Zicari · Published September 1, 2010 · Last modified February 16, 2014