XenForo is a commercial Internet forum software package written in the PHP programming language. The software is developed by former vBulletin lead developers Kier Darby and Mike Sullivan. The first public beta release of XenForo was released in October 2010, the stable version on March 8, 2011. The program includes several search engine optimization (SEO) features.
On November 12, 2014, Chris Deeming joined the development team. One of his products, Xen Media Gallery, now XenForo Media Gallery, joined the XenForo family of products.

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