[August 2018 update]
Classical message boards are now a thing of the past. Do not get me wrong! I am still a regular of some sites that use vBulletin (https://forums.watchuseek.com) but these are not technically evolving anymore.
Look around for a couple minutes and you will also find mixed textual-audio communities and more interesting developments.
n2 is the result of the merger of two exciting forums software: wtcBB and nextBBS.
It’s easy to use and easy to admin.
Lean everything you need to know at http://n2.nextbbs.com
Note: the software is stable and will not lose your data. However some features are still considered alpha quality.