LucidDB

LucidDB is the first and only open-source RDBMS purpose-built entirely for data warehousing and business…

Firebird RDBMS

https://www.firebirdnews.org/docs/fb2min.html Firebird is a fully featured and powerful RDBMS. It can handle databases from just…

LevelDB

LevelDB is a light-weight, single-purpose library for persistence with bindings to many platforms.

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…