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Deductive Database with Datalog, SQL, RA, TRC, DRC
The Datalog Educational System (DES) is a deductive database with Datalog, SQL, Relational Algebra, Tuple Relational Calculus and Domain Relational Calculus as query languages developed mainly for education. It can be used from most common Prolog interpreters over any supported OS and from portable executables (Windows, Linux and MacOS).
Yadlr is a toolset for many-valued inference, both deductive and inductive. It features a fuzzy reasoner, using CLP(Q,R) to implement fuzzy algebra on top of a resolution-based back-end. It also features Prodlr, an ILP system targeted at learning Description Logics and threaded-variable theories, like DCGs.