Sukiyaki was born out of what the author sees as a much needed improvement to current imageboard/BBS software. They're flaky, often have security flaws that users take advantage of, and worst of all, they have the same UI from the mid-nineties. It's time for an update! Sukiyaki visually organizes replies in threads so that it is clear who the reply is sent to. It is written using Django with its wonderful ORM, which helps reduce security vulnerabilities. It has been tested in production and is stable. It also includes a unique system for user-ranking of posts. Planned features include RSS updates for individual boards and threads, and there is a faster backend (Django-Treebeard).
WCN:Talk (originally called "FutureForum") is a Web discussion forum written in Perl and MySQL. It has many options, including message selection and sorting on the top index page. It also has collapsible branches, a menu that toggles between 'no menu', 'simple', and 'advanced' modes, full text search capability, the ability to send email to the admin and original poster, and many other features. It includes password protection, HTML templates, file uploads, message subscription, multiple discussion sections, and a lot more.
SimpleForum is a forum that is designed to work on all HTTP servers which support CGI. It is very easy to configure, and does not require the user to have knowledge of any programming language. It has all the basic functions that a forum should have and a lot more. Additionally, it allows you to change the appearance of the forum (font, font color/size, background color/image, etc.) to your liking. You can also set different languages.
BBSzilla is an extension for Mozilla-based browsers such as the Mozilla Application Suite and Firefox. It gives the browser the ability to connect to Bulletin Board Systems that utilize TCP/IP, such as Hotline servers. There is functionality for multi-user chat, single-user messaging, as well as server-side and P2P file sharing, threaded news, single-thread bulletins, and more.
The PunBB JumpBox provides a fully self-contained instance of the powerful PunBB forum in the time it takes to download. PunBB is a lightweight discussion forum that provides the essential features to host a thriving community without the tedious database, Web server, and application setup. It may have fewer bells and whistles than other forum applications but it has an intuitive user interface and renders XHTML-compliant output.