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MyBB is a free bulletin board system software package developed by the MyBB Group. A lot of thought has gone into the MyBB interface to make it easy to use. MyBB uses a standard discussion board structure, so your visitors will feel familiar with the way MyBB works. Your visitors can use the MyBB user control panel to change the way they view discussions. They can also easily start and reply to discussions and markup their posts. The forum administrators and moderators can use MyBB's inline editing and moderation features to control discussion and keep the forum tidy.
MyBB is a free, open source forums platform that has been around for quite a while (since 2002). It is often seen as a ‘smaller’ player in the forums world but it is still very popular. In fact, it is growing in popularity all the time. It is supported by a community of about 28,000 people who contribute in various ways to the success of the platform.
This platform is built primarily on PHP with a MySQL database, however, it does have some AJAX and other items included to help make it very usable. Users of this forums platform will find it to be very easy to use. Administrators of a MyBB platform will have a little bit of a learning curve compared to other options, but once you get the hang of it you will have no trouble running your site properly.