XSB
A research-oriented Logic Programming system for Unix and Windows/DOS-based systems, representing a semantically enriched functional superset of Prolog and offering among other things evaluation through full SLG resolution.
XE
Resulting from the Exbed project, this general-purpose programming language supports data abstraction and rule-based programming and is based on but is not a formal extension of CLU.
Xcerpt
A logic-based query and transformation language for XML and semistructured data.
The World Wide Web Virtual Library: Logic Programming
Affiliated with the comp.lang.prolog newsgroup this repository includes general information, Prolog, Window system interfaces, other logic-programming systems, meetings, books and related information.
What are Logic Programming and Prolog?
Clear explanation of logic programming, and merits of declarative languages.
TyRuBa
Type Rule Base is an experimental logic/metaprogramming language for generating Java code. This BSD-licensed free software resembles Prolog, is implemented in Java and provides a simple command-line interface.
Starlog
Declarative temporal logic programming language for: general purpose programming, simulation, modeling reactive systems. Starlog programs consist of 2 components: a set of timed facts, a set of temporal logic rules. Somewhat like Prolog.
Special Interest Group on Logic Programming and Nonmonotonic Reasoning: LPNMR
Forum for exchange of information on the area of logic programming (LP) and nonmonotonic reasoning (NR): questions in LP related to NR, and in aspects of NR that bear directly on LP: definitions, links to software and related sites.
SampleTalk Language and programming technology
Build a program immediately from data processing examples: AI language, simpler than Prolog, based on generalization and matching of unconstrained text processing samples.
PC AI - Logic Programming
As part of a survey of information on artificial intelligence this section on logic programming is provided.
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