A forum is an online discussion board wherein anybody will be able to participate on a particular topic. Forum features, include creating a new topic or a threaded discussion, create a poll or survey, provide subscription features, file attachment features to any threaded discussions, provide search facility and so on. Forum will always be an excellent choice if you want to provide a solution to a list of problems, create a product review site or to create a collaborative platform thus, by providing support to your users.
Here are some list of free CMSs with which you will be able to create your own forum
1. phpBB
2. JForum
4. myBB
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Social Networking