wpDiscuz Premium Extensions Bundle has dozens of addons. You can extend the functionality of your site with this plugin.

easyComment is a PHP commenting system. easyComment gives you everything you could want in a comment system.

RSComments! will make your site complete! Unlike other content management systems, Joomla does not have an integrated commenting system.

JLex Comment is a powerful comment system for Joomla. It provides a quick way to let your readers post comments on your content pages or provide valuable feedback.

Comment Tools Pro adds an arsenal of practical tools for your WordPress Blog’s comment section. UpVote / DownVote comments is also supported.

Transform your ordinary WordPress Comment into this Interactive New Look with upload images and also displays videos from popular sites such as YouTube, Vimeo and many others.

Spam Control blocks spam traffic hooked onto your website and shreeds it automatically.