someone probably already posted this but how do i make a site like this with message boards and stuff?

Forums:

phpbb (http://phpbb.com/)
Yabb Forums (http://www.yabbforum.com/)
teemz (http://www.teemz.com/)
anyboard (http://netbula.com/anyboard/)


Remotely hosted forums:

Conforums (http://www.conforums.com/index.html)
Proboards (http://www.proboards.com/index.html)
Boardnation (http://www.boardnation.com/)
Hosted Scripts (http://www.hostedscripts.com/)
Sudden Launch (http://www.suddenlaunch.com/index.html)
easyboard (http://www.ezboard.com)


taken from the sticky at the top of this section