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Logtalk is an Open-Source, object-oriented logic programming language that extends and leverages the Prolog language with a feature set suitable for programming in-the-large.

Logtalk supports modern code encapsulation and code reuse mechanisms without compromising the declarative programming features of Prolog. Logtalk is implemented in highly portable code and can use most modern and standards compliant Prolog implementations as a back-end compiler. The Logtalk distribution features portable libraries and portable assertions, documenting, diagraming, and unit testing tools, plus extensive code editing and

What's New

Version 3.09.2:
Logtalk Compiler and Runtime
  • [Changed] Expand the file argument of include/1 directives as a source file argument (thus allowing the file name extension to be omitted).
  • [Changed] Exception thrown when a category attempts to complement itself for consistency with similar cases.
  • [Improved] More strict compiler checking for valid entity relations


  • OS X 10.3.9 or later
  • Compatible Prolog compiler

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Current Version (3.x)


Downloads 8,799
Version Downloads 25
License Free
Date 16 Feb 2017
Platform OS X / Intel 32
Price Free
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