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I found this neat bulletin board software, it is written in modern PHP (8.3+) and has some nice features. I don't care who wrote it or where it's used, I only care about the code itself though so be warned before visiting their website https://kokonotsuba.github.io (anime oldfags)
I'm sure it's cool if you know anything about web development. I'm sure heyuri was (is?) cool if you were an otaku, too.