EasySocial
EasySocial is everything you need to start a social network in Joomla. EasySocial is best for enterprises and intranets.
EasyBlog
EasyBlog is a Joomla blog extension combining social media tools, integrates with Joomla templates and works with other Joomla extensions.
EasyDicuss
EasyDiscuss is the best question & answers extension for Joomla 1.5 and Joomla 2.5. It works like a forum or a discussions area for your Joomla website.
Kunena
Kunena is the leading Joomla forum component. Downloaded more than 3000000 times in nearly 5 years, Kunena is the Forum extension for Joomla!. Community forum, documentation, demo.
Mijoshop
MijoShop is an e-Commerce extension for Joomla 1.5, 2.5 and 3.0. It is a turn-key ready out of the box Joomla shopping cart solution.
JomSocial
Open Source Social Networking Software. Award winning open source community software by JomSocial. This social networking software is widely used by numerous Joomla lovers all over the world.