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- A free application development platform streamlining the design, development and maintenance of software applications.
- 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.
- A truly relational language in Python. In development, early release available to gain feedback.
- A copylefted C library.
- A planned reimplementation of one of the first relational systems, the British G-Exec from the 1970s, based on the open world assumption
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.
- 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.
Raquel Database System
- A Third Manifesto‐compliant RDBMS from Northumbria University, England. Free software.
- An in-progress copylefted flavour of Tutorial D implemented in Java.
- 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.
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