There is apparently a web framework (http://eu.swi-prolog.org/ http://eu.swi-prolog.org/), and they do mention commercial sponsors both as users and as contribu

There is apparently a web framework (http://eu.swi-prolog.org/ http://eu.swi-prolog.org/), and they do mention commercial sponsors both as users and as contributors. It's no PHP or Javascript to be sure, but there are some users.