CrateDB

CrateDB offers Standard-SQL, real-time queries and document support (JSON) in a simple, horizontal way to scale.

Apache Kudu

A Kudu cluster stores tables that look just like tables you’re used to from relational…

RaptorDB Document Store

https://github.com/FransBouma/Massive NoSql, JSON based, Document store database with compiled .net map functions and automatic hybrid…