Punbb

It can add a live chat room to PunBB, multiple skins, customizable, easy to install, users single sign-on and free hosted.

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Developer: joy wang
License: GNU General Public License (GPL)
Operating System: Unix, Mac OS X, Win98, XP, Vista

PunBB is a fast and lightweight PHP powered discussion board.

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Developer: Rickard Andersson
License: Freeware
Operating System: any