RBBS (Raving Bulletin Board System) is a bulletin board system with Web interface. Users of RBBS can post new articles and can attach responses to existing reports. Although the principal purpose of RBBS is to be used as a communication system like a BBS, it is also useful for individual use and for one-to-many communication.
Pipo-BBS allows you to install a BBS server and clients. You can chat via a nice interface with an unlimited number of people (as with IRC). This software is in a pre-release state; it is still very alpha, and can be difficult to even compile. It works under linux, MkLinux, SGI, HP-UX, and Solaris. The only interface for this BBS is telnet for the moment; an interface using GTK has been started. It has been translated into French, English, Spanish and German.
WowBB is an innovative bulletin board with features including an auto install/upgrade, a WYSIWYG editor with integrated spell-checker, automatic time zone detection, smart caching, a visual CSS editor with real-time preview, users selectable by location, and search engine friendly URLs. It can read and write the database formats of Invision Board, phpBB, UBB.Threads, and vBulletin.
mconv is an Internet BBS modelled after Monochrome BBS (menus rather than a command line). It includes several utilities for the conversion of BBS attributes to plain text, ANSI colour text, and HTML. It can also convert session logs and scrollback buffers to BBS format so they can be viewed in the BBS or in the included standalone file viewer.
Fruit Show is a minimalist forum package based on the forums at joelonsoftware.com. It is based on the philosophy that social atmosphere is a by-product of software design. There's no registration and very few features for visitors. It's skinnable and easy to install. It also contains some unique moderation features. Fruit Show is intended for small sites that need an easy to use and accessible forum.