Discussion Forums are a great way of ensuring active participation from your website’s visitors. Of late, many established blogs and websites have been running forums wherein their users can interact and discuss matters of relevance (and irrelevance, depends on the mood). When it comes to running a forum, the options are plenty – both free, and commercial. For WordPress users, arguably, the weapon of choice should be bbPress – as it offers seamless integration with WordPress (to the extent that a common login for the blog and the forum will work, no separate accounts). But in this article, I’ve attempted to wind up free (and essentially open source) forum scripts that run equally well with most popular CMSes. Before we begin, just a note: the list is in alphabetical order.