Forums (BBS') can't just do html to html, they need to be told what their doing, either through PHP or Perl.
UGN Security uses the (nonfreeware) InfoPop UBB.Classic, it's a Perl BBS system, it works quite well.
InfoPop also has UBB.Threads which is a PHP/MySQL bulletin board system.
Theres also Invision, PHPBB, there are loads of boards.
Why do you need one with no Javascript or Perl (CGI)