XenForo – a commercial, closed-source application for hosting an internet forum. The application is written in the PHP programming language using the Zend Framework. The software is being developed by former vBulletin makers Kier Darby and Mike Sullivan. The first public beta of XenForo was released in October 2010. XenForo 1.0.0 Stable was released on March 8, 2011. XenForo has several search engine optimization (SEO) features built in.
One of the founders of XenForo, Kier Darby was initially the lead creator of the vBulletin community platform. The original owner of the software, Jelsoft, was acquired by the US internet media company Internet Brands in 2007. There were disagreements between the developers and the new management regarding the next major version of vBulletin 4.0. While the team wanted to make 4.0 a complete overhaul of the platform, Internet Brands insisted on using the software over existing code instead. These internal conflicts saw most vBulletin developers step down from employment at Internet Brands in 2009. As part of the new team, Darby and others, former vBulletin developers began working on a new platform known as XenForo.
On November 12, 2014, Chris Deeming officially joined the development team. One of his products, Xen Media Gallery, now XenForo Media Gallery, has joined the XenForo product family.