SWI-Prolog offers a comprehensive Prolog environment. Together with its graphics toolkit XPCE, its development started in 1987 and has been driven by the needs for real-world applications. These days SWI-Prolog is widely used in research and education as well as for commercial applications.
License: GNU LGPL.
Tags: logic, logic programming.
Interfaces: command line, X.
Supported language: Prolog.
Homepage: http://www.swi-prolog.org/.
Documentation: http://www.swi-prolog.org/documentation.html.
Source repository: http://www.swi-prolog.org/git.html.
Bug database: http://www.swi-prolog.org/bugreport.html.