BBPress used to be a fork of WordPress that provided users with pretty good free forum software. The downside? It was a lot of work to skin and it was fairly tricky to update the software. Those last two things are way easier now that BBPress has been converted into a WordPress plugin, and you can download the beta today. The BBPress plugin adds admin menus to your WordPress as well as page templates and shortcodes that allow you to set up forums from within the admin. It’s glorious.