Forum Software
Have a community | Vanilla Open-source standards-compliant discussion forum (Php/MySQL) |
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Commercial, but one of the most popular forum packages (Php/MySQL) |
 | PhpBB Open-source. Reputation for being buggy/insecure (Php/MySQL) |
 | SMF Simple Machines Forum. Free, but not OS. (Php/MySQL) |
 | IPB Invision Power Board - Commercial, but pretty popular (Php/MySQL) |
 | Phorum Open-source, nice product (Php/MySQL) |
 | bbPress Forum software from the makers of Wordpress. [free] |