First We really like the Joomla content management system because it is pretty easy to use, can be search engine optimised and with extensions is a very flexible web development platform. but it unlike Wordpress and drupal doesn't come with a comment system pre-installed in Joomla! 2.5 and 3.X, So today we're going to talk about comment extensions for Joomla, few of them are commercial, if you know some more effective comment form extensions.
Komento (free and commercial)
Komento gives you the freedom to speak your mind and better engage with your communities
CComment (free and commercial)
CComment is a flexible & easy to use comment system for Joomla. It integrates with a lot of 3rd party components, looks great and is a definite fit for any Joomla website.
With JV Comment, adding a comment system to your articles is now as simple as installing a plug-in and adjusting a few parameters! Two type of comment system: JV Comment and Face Book Allow user to set the maximum reply level
RokComments is a complete rewrite of the ever-popular RokIntenseDebate plugin.
JComments allows to website visitors to leave comments to any published materials. It provides the flexible system of access rights settings, wide possibilities of custom view setting, uses the AJAX technology and provides many other features.