phpBB: free and open source message board software with a variety of features, personalization options, extensions, styles, BBCodes and much more.

phpBB, Open Source Software, Freeware, Message Boards, Forums, Website Community, Bulletins

https://www.phpbb.com/about/features
https://www.phpbb.com/downloads
https://www.phpbb.com/extensions
https://www.phpbb.com/styles
https://www.phpbb.com/community/ideas