MetaDirectory
- Dataphor
- A free application development platform streamlining the design, development and maintenance of software applications.
- MighTyD
- A prototype for demo purposes, the first implementation of the temporal database model devised by Lorentzos, Darwen and Date. Uses Tutorial D and PostgreSQL, being compliant with The Third Manifesto.
- Dee
A truly relational language in Python. In development, early release available to gain feedback.
- Duro
A copylefted C library.
- G-Exec2
A planned reimplementation of one of the first relational systems, the British G-Exec from the 1970s.
- IBM Web Relational Blocks
A visual language for constructing enterprise applications: relations are the only data-type which flows between components, and uses relational algebra A.
- Ingres Project D
A research project that will provide a native implementation in Ingres of the Tutorial D language.
- Muldis Rosetta
Reference implementation of Muldis D, a programming language with fully integrated database functionality, that understands OOP and implements all of the relational operators, providing all the features of The Third Manifesto.
- Open Database Project
A pure relational database model and implementation including object classes as data types orthogonal to relations.
- Rel
An in-progress copylefted flavour of Tutorial D implemented in Java.
- SIRA_PRISE
An effort started by Erwin Smout to build a usable TRDBMS.
- Tcl Relational Algebra Library
A C-based extension of the TCL language implementing relational algebra.
