Forum Tools

phpbb forum toolphpBB™ (“PHP Bulletin Board”) is the world's leading Open Source forum software. Distributed under the GNU General Public License, phpBB is free software, developed by volunteers from around the world. phpBB is used on over 2.4 million commercial, non-profit, social networking and community websites in over sixty languages. 
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simplemachines forum toolSMF is an advanced community software package that enables you to set up and manage online community forums.
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vanilla forums tool

Vanilla Forums is a free lightweight and extensible open source forum software using PHP scripting language and MySQL database management system.

Important note: If you currently have version 1.1.10 (or earlier) installed, please be aware that Vanilla Forums does not offer a direct upgrade option. You will have to install Vanilla Forums 2.0 in a new folder as a fresh install, and follow their instructions to export your old forum data ( Please also note that Vanilla Forums is no longer supported on Windows hosting accounts.
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yetanotherforum toolYetAnotherForum.NET (YAF) is a Open Source discussion forum or bulletin board system for web sites running ASP.NET. The latest version is ASP.NET v2.0 with a Microsoft SQL Server backend. The full C# source code is available licensed as GPL. 
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