Phorum

Phorum is a web based message board written in PHP.

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Developer: http://www.phorum.org/
License: Freeware
Operating System: Unix

Simple ppC++ phorum is multi-platform compatible.

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Developer: Shalmoo Y
License: Freeware
Operating System: Unix/Linux/Windows

W-Agora (Web-Agora) is a professional database-driven communications system which allows you and your visitors to store and display messages, files, and other infos on your web site.

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Developer: Marc Druilhe
License: Freeware
Operating System: Unix, Windows