Java in-memory SQL92 DBMS with sane NULLs processing. Purports to actually strive to follow Codd's rules.
Another relational-like Unix simple files database.
An incomplete relational algebra DBMS. [Free software, GNU GPL]
A descendant of RDB.
The first implementation corrupted from the relational model, was the basis for SQL and DB2. A site preserving early history of a technology that became a critical business tool.
Another Unix filter implementation of some relational ideas.
A very simple quasi-relational DBMS based on Unix shell commands.
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