Homeland

Homeland is an open-source community/forum system for business use.

Directly

Directly provides on-demand customer service apps.

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

FUDforum is a free and open source Internet forum software

Flarum is the next-generation forum software that makes online discussion fun. It’s simple, fast, and free.

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

SocialGO enables users to create custom social networking websites.

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.

esoTalk is a free, open-source forum software package built with PHP and MySQL.

jforum is a Java-based discussion board software.