Memcached by Roberto Zicari · Published January 1, 2011 · Updated February 16, 2014 Free & open source, high-performance, distributed memory object caching system. LINK
Couchbase NoSQL database January 21, 2015 by Roberto Zicari · Published January 21, 2015 · Last modified March 12, 2015
Apache Cassandra January 1, 2011 by Roberto Zicari · Published January 1, 2011 · Last modified February 16, 2014