Originally released commercially in 2002 under GemStone Systems as Gemfire, it was first used in Wall Street trading platforms. In 2010, GemStone Systems was acquired by VMWare and by 2013, Pivotal had spun out of VMWare and took Gemfire with it. Pivotal then proceeded to submit Gemfire to the Apache Incubator in 2015 under the name Geode, and was graduated to a top-level project in 2016. Now, Geode is used in many businesses with high-scale applications.
http://geode.apache.org/releases/
http://geode.apache.org/releases/latest/javadoc/index.html
Apache
2015
Gemfire
C#, C++, Groovy, Java, Python, Scala