Rel (DBMS)
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Rel is an Open Source true relational database management system (TRDBMS) that implements a significant portion of Chris Date and Hugh Darwen's Tutorial D query language.
Primarily intended for teaching purposes, Rel is written in the Java programming language.
Rel was created by Dave Voorhis.
The latest version of Rel is 0.0.13 Alpha and was released on 5 September 2005. A new version is currently (as of 31 July 2007) under development.