Thord Daniel Hedengren is addicted to words, which is probably why he keep writing books and never shuts up about writing. He is a contributor to numerous magazines and sites, as well as the owner of the Odd Alice web agency in Stockholm. You should follow this crazy Sweden on Twitter where he mixes wisdom with nonsense and the occasional jab as @tdh.
Forums have been around forever, so it should come as no surprise that several plugins for the popular publishing platform WordPress provide this feature, as well as support for integrating other forum software. One project, however, has a special place in the WordPress community, and that is bbPress. This is the software created by WordPress founder, Matt Mullenweg, as a lightweight system for the Wordpress.org support forums. In true open-source fashion, the bbPress project was born (at bbpress.org, of course) as a lightweight standalone alternative for forums.
The problem is that the project never really kept up the pace; and while the WordPress community wanted to use it, and bbPress saw some promising spurts of development, it never really caught up to the alternatives. Most of us who needed a forum went either with a plugin alternative that integrated perfectly or with forum software such as Vanilla.