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PhpBB is GPLv2, and it still works just fine. Discourse is also GPL, if you’re looking for a more modern look. There are a number of others too (https://en.wikipedia.org/wiki/Comparison_of_Internet_forum_s...)

Does PhpBB have an adaptive layout? I've used several older forums that require scrolling sideways because they don't.

The UI looks the same after all those 20 years.

And this is a feature!

Literally feel waves of nostalgia looking at that layout. It's perfect!

Which means it works?

Good question. It seems to be a half empty/full glass situation.