phpBB is a UBB-style dissussion board written in PHP backended by a MySQL database. It includes features such as posting/replying/editing messages, private messages, private forums, user and anonymous posting, robust theming, user ranking by posts or by special, admin definable, ranks, and much more.
Citadel is an advanced messaging and collaboration system for groupware and BBS applications. Users can connect to Citadel using any telnet, WWW, or client software. Among the features supported are public and private message bases (rooms), electronic mail, real-time chat, paging, shared calendaring, address books, mailing lists, and more. Unlike other collaboration servers, Citadel provides its own data stores and is therefore extremely easy to install; you don't have to "bring your own" email and database because they're built in. The server is multithreaded and scalable. In addition, SMTP, IMAP, and POP3 servers are built-in for easy connection to Internet mail. Citadel is both robust and mature; it has been in production since 1987.
PunBB is a fast and lightweight discussion board. Its primary goal is to be a faster, smaller, and less graphic alternative to otherwise excellent discussion boards like phpBB, Invision Power Board, and vBulletin. It has fewer features than many other discussion boards, but is generally faster and outputs smaller pages.
PHPX is a Web portal system, blog, Content Management System (CMS), forum, and more. It is designed to allow everyone to be able to have feature-rich, interactive websites even if you do not know a bit of programming. Some key features include fully-integrated forums, downloads, an image gallery with slideshow and auto-thumbnailing, support ticket system, a GUI interface for Web page content management, news with topics and instances, and a whole lot more. It allows you to fully customize the look of your site.
miniBB is a flat, linear, highly customizable BB. It features MySQL, PostgreSQL, and MSSQL support, table name definitions, color skins, language packs, HTML templates, access control, smilies, search, basic BB codes, member titles and ranks, moderators, email notification, statistics, encrypted cookie logging, IP and user ID tracking and bans, spam protection, "sticky" topics, a powerful admin panel, and more.
OPT (Outreach Project Tool) is a PHP general-purpose virtual commonplace for customers and developers to collaborate in developing projects. The system provides documents archive, e-mail archive, request tracker, task management, knowledge base, news administration, newsletter support, and a lot of other features (some project-based, some system-based).
This program hopes to become a viable MS Sharepoint clone. It is basically a Web interface to a document repository (Frontpage Web), but with many other features. It depends on Frontpage extensions for remote authoring; otherwise it is independent. It includes a forum, calendar, event tracking, announcements, tasks, file check in/check out, user management, email, and more.
bbs100 is a BBS in the style of DOC and/or YAWC. DOC is a style that remotely resembles Citadel. What's special about bbs100, is that it's a single process daemon that handles all connections at once, while consuming very low cpu resources ( < 1%). It can handle over a thousand simultaneous users. It is highly customizable, is easy to setup, and has many configurable features. bbs100 is almost a must-have for people that want to run a DOC-style BBS.