TinyIB is a lightweight PHP image board which emulates the functionality of 4chan. If you use MySQL or SQLite, you can use it to create an efficient setup able to handle large amounts of traffic. If you don't use a database, it can store posts as text files for a portable setup capable of running on virtually any PHP host.
Ansilove/PHP is a set of tools that convert ANSi and artscene-related file formats into PNG images, supporting ANSi (.ANS), PCBOARD (.PCB), BiNARY (.BIN), ADF (.ADF), iDF (.IDF), TUNDRA (.TND), and XBiN (.XB) formats. It includes a command line converter and a library for doing "on the fly" conversions. It creates optimized 4-bit PNG files and supports SAUCE, 80x25, 80x50, Amiga fonts, and iCE colors. It supports 14 MS-DOS charsets (IBM PC, Baltic, Cyrillic, French Canadian, Greek (CP737 and 869), Hebrew, Icelandic, Latin-1, Latin-2, Nordic, Portuguese, Russian, Turkish) as well as unofficial charsets (Armenian, Persian).
FUDforum is a templatable forum with i18n support based on PHP and either MySQL, Oracle, PostgreSQL, or SQLite. It features a user/group management system, a multi-lingual spell checker, both flat and thread message views, a private messaging system with multi-user forwarding capabilities, poll file attachments, and much more. It is an extremely fast and scalable forum that can fulfil the needs of both small and large forum operators.
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.
Oxygen is a powerful online discussion board system. Posted messages are displayed on the forum with the name, topic, moderator type, total post, and the date of the last post. It supports anonymous users and gives registered users full rights to edit, delete, and add their messages to the forums.
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.
vmodemd is a telnet server designed to run old DOS BBS systems and door games. It listens for incoming TCP connections on a defined port, does a minimal telnet handshake if needed, and then starts to proxy all data to a PTY which is bound to a dosemu virtual serial port. vmodemd supports any number of virtual modems, can display customized banners if all modems are busy, can terminate a serial app when a telnet connection is unexpectedly dropped, and run custom scripts before passing control to dosemu, allowing you to pass relevant data like incoming IP address to the DOS app.