Sylbi is a conversation system built with Perl and MySQL. Not a forum, and not a blogging platform -- instead, actually both -- Sylbi grew from the idea that a blog with comments and a forum only differ in their perspective of the conversation.
I was a bit disappointed. The files were of mixed format - different line endings, they were of mixed encoding (ISO-8859-1, UTF-8). This is sort of things are a recipe for disaster. I had to fix the (my)SQL input file to indicate an input-type of utf-8. I also had to unify the files - convert them all to the same line endings, and utf-8, and fix all the template files to report content as text/html utf-8. Even having done all of this, the pages still insist that the pages are text/html ISO-8859-1! BIG disappointment. Wouldn't recommend this. :(