SocialGO

SocialGO enables users to create custom social networking websites.

BuddyPress

WordPress social networking in a box.

Directly provides on-demand customer service apps.

Discourse is an open source discussion platform built for the next decade of the Internet.

Social Network For Joomla to grow your communities with the least time.

Opensource social network engine

Forumbee offers community forums for discussions, feedback and Q&A.

Build a community and a business on mobile

MyBB is a discussion board software that runs on PHP and MySQL

eXo Platform

Build an engaging community forum using Vanilla’s modern cloud forum software.

Intuitive. Social. Engaging. Fast. XenForo brings a fresh outlook to forum software.

Communities at Zimbra.

jforum is a Java-based discussion board software.