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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 3.08.0:
Logtalk Compiler and Runtime
  • [Changed] Ensure that in compiler error and warning messages the file and line information is always the last line for the reported issue.
  • [Changed] Also save reflection data for uses/2 directives for resources in the pseudo-object user.
  • [Added] Define a library path for the coding directory as it


  • OS X 10.3.9 or later
  • Compatible Prolog compiler

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Current Version (3.x)


Downloads 8,687
Version Downloads 32
License Free
Date 17 Oct 2016
Platform OS X / Intel 32
Price Free