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.
Datum is a Web application which shares data from databases and information related to these databases. The core of the software provides user management and permissions, news, file sharing, visualisation of the database schema through WWWSQLDesigner, data reports with charts, dynamic charts, an asynchronous daemon, internationalization, a help system, database management with optimization and triggers, and user history. Modules can be added to add special functionalities or interfaces for a database.
Roundcube Webmail is a browser-based, multilingual IMAP client with an application-like user interface. It provides the full functionality you expect from an email client, including MIME support, address book, and folder manipulation. High extensibility is granted by the plugin API and the user interface is fully skinnable using XHTML and CSS 2.
Txt2tags converts a text file with minimal markup to HTML, XHTML, SGML, DocBook, LaTeX, Lout, Man page, Creole, Wikipedia, Google Code Wiki, PmWiki, DokuWiki, MoinMoin, MagicPoint, PageMaker, AsciiDoc, or ASCII Art. It is simple and fast and features automatic TOC, macros, filters, include, tools, GUI, CLI, and Web interfaces, translations, and extensive documentation.
PHP iAddressBook is a Web-based address book for a single user. It supports personal or business cards (tons of fields), spotlight-like search, categories, transparent vCard import/export, multi-language support, design templates, and an intuitive interface. It aims at 100% compatibility with the address book in Mac OS X.