Please, am seeking information on how to design a Wordpress based forum site, or a standalone forum website that will have similar function like site point forum. I know of a plugin bbpress, but it seems like it has some limited features.
Thanks for your response.
If you want to go with a forum that's not built on Wordpress (like Sitepoint) then you have a few options, the most popular 3 are:
Personally, I would go for Invision.