A Tutorial D on MS.Net with data independence as a main goal, running its own storage engine.

A fully-working C# and MS .Net-based implementation. Had to accept contamination by SQL NULLs due to using SQL DBMSs as storage engines.

A copylefted C library.

A planned reimplementation of one of the first relational systems, the British G-Exec from the 1970s.

A copylefted C-like relational programming language with OO as a second design goal.

An in-progress copylefted flavour of Tutorial D implemented in Java.