ALS Prolog

A commercial Prolog implementation for DOS originally introduced in 1985 that was later ported to sundry UNIX like systems, Apple Macintosh and MS Windows and has since been open sourced. It features an incremental native code compiler, a two way C and Objective-C language interface, a source code trace debugger and more.

The package is primarily a intended for use with the command line but does come with Tcl/Tk based windowed user interface that is a tad outdated.

Note that a number of older target systems are missing from the current open source release and would need to be recreated, the only currently supported systems are 32 bit Windows and Linux.

Licence

 * Originally a commercial software package release under a proprietary licence, currently an open source project released under the MIT Licence.

Links

 * ALS Prolog GitHub home page
 * Applied Logic Systems, Inc.: ALS Prolog homepage