D4 is an open source programming language created in 2001.
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Dataphor is an open-source truly-relational database management system (RDBMS) and its accompanying user interface technologies, which together are designed to provide highly declarative software application development. The Dataphor Server has its own storage engine or it can be a virtual, or federated, DBMS, meaning that it can utilize other database engines for storage. Dataphor has been praised for its adherence to relational principles, more closely so than any SQL product.. Read more on Wikipedia...