swi-prolog-x - 9.0.4+dfsg-4 main

SWI-Prolog is a fast and powerful ISO/Edinburgh-style Prolog compiler with a
rich set of built-in predicates. It offers a fast, robust and small
environment which enables substantial applications to be developed with it.
.
SWI-Prolog additionally offers:
.
* A powerful module system
* Garbage collection
* Unicode character set handling
* Unbounted integer and rational number arithmetic
* Multithreading support
* A powerful C/C++ interface
* GNU Readline interface
.
XPCE is an object-oriented symbolic programming environment for user
interfaces. Although XPCE was designed to be language-independent, it has
gained popularity most with Prolog.