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We often don't learn from the greats of computer science (all sorts of APL goodness from the 70s is being rediscovered for data science today).

As far as modern Prolog. I know commercial systems still exist, but I assume most work has switched to SWI-Prolog?

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Do not forget SICStus, it´s jitter is truly excellent.

Yeah, I've heard a bit about that one, but have lumped it into the commercial ones that you'd have to have a solid need to justify a license cost like running something important in production that requires support or you'd probably need an academic license.

https://sicstus.sics.se/order4.html

Includes an evaluation license (free) and a personal license for EUR 165.

The personal license cannot be used for any commercial purposes (basically just academic research or play). The single-user commercial license is over $2000. Not that any of that is unreasonable in industry, but you're making it out to be cheaper than it is.

$2250 is the first year. Then $750 a year. This includes support. To my understanding, development alone without distribution falls under the personal license.

Should have been EUR in place of $

Can anyone point to prolog systems still in production?

Michael Hendricks has a few neat talks on YouTube and InfoQ on how they use Prolog in production.

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