Some logic programming languages like Datalog or ASP (Answer Set Programming) are known as purely declarative languages. These languages allow statements about what the program should accomplish.

Ciao is a modern Prolog implementation that builds up from a logic-based simple kernel designed to be portable, extensible, and modular.

Prolog is a logic programming language developed in the early 1970s that is about objects and relationships between objects. It aims to be a declarative programming language, i.e. Prolog programs ...

Abstract: The evolution of a concurrent Prolog system is described in the paper. Started originally as a Prolog application, the T-Prolog system was a special extension of Prolog for discrete event ...