How to build a community website with Joomla! Created August 23, 2016 Category Joomla, Applications Joomla! is a good CMS choice if you want to build a community website, and there are a number of extensions listed on the Joomla! Extension Directory (JED). One of the most popular Joomla! community extensions is Community Builder. It’s well established, and it has a large number of 3rd party extensions. Another well supported Joomla! community extension is JomSocial which also has a good selection of 3rd party extensions.