http://www.free-forum-software.org/

http://www.yabbforum.com/

http://www.webwizguide.com/webwizforums/default.asp

http://www.forumsoftware.ca/

http://en.wikipedia.org/wiki/Comparison_of_Internet_forum_software

http://en.wikipedia.org/wiki/Category:Free_Internet_forum_software

http://www.mewsoft.com/Products/Boardawy/Features.html

http://www.mybboard.net/

http://www.forumotion.com/en/Computers-and-Internet/Software-73.htm

http://www.forumotion.com/en/tag/software