I did a similar search about two years ago, and founds lots and lots of bulletin board scripts in Perl, but the number that actually supported thread views was very small. And at that time I wanted threads very badly (and I still hate discussion boards without threading)
When I discounted those that were last updated anno 2000 or earlier, there were only a few left: the Everything engine (from which perlmonks is derived), slashcode and liveojournal (actually two blogging engines which can be abused for discussion boards, but far too big for me).
A bit later tinita wrote battie (a portal solution, actually) to host the board of the German perl community. So far it's the only perl based non-bloated board with threads of which I know that it hasn't been abandoned, but I haven't tried to install it yet.
Maybe my standards were too high at the time of searching, but I found the results quite disappointing back then
In reply to Re: discussion board wanted
by moritz
in thread discussion board wanted
by John M. Dlugosz
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