Benjamin L. Russell wrote:
Not all students and researchers can afford a Personal
License. Can you recommend an alternative, fast
Prolog development system under a free licensing
agreement, such as GPL/GLPL?
You have quite a choice if you relax your licensing requirements:
http://www.thefreecountry.com/compilers/prolog.shtml
You will find there the GNU-Prolog, whose licensing should be as
you wish.
Jerzy Karczmarczuk
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