PluXml
PluXml is a script helping you to create a site or a blog.
ElkArte
ElkArte is a modern, powerful community building forum software.
Zimbra Communities
Communities at Zimbra.
Board3
Board3 is a phpBB extension enabling users to add a portal with several blocks to the front page of phpBB forums.
esoTalk
esoTalk is a free, open-source forum software package built with PHP and MySQL.
Homeland
Homeland is an open-source community/forum system for business use.
jforum
jforum is a Java-based discussion board software.
Asgaros Forum
Asgaros Forum is a forum solution for WordPress.
Gossamer Forum
Gossamer Forum is a forum software to create an online community.
miniBB
miniBB is a standalone, open source program for building your own Internet forum.