The Free / Libre / Open Source Web App with the most built-in features
...Major features include a wiki engine, newsarticles, discussion forums, newsletters, blogs, file galleries, bug and issue trackers (form generator), polls/surveys and quizzes, banner management system, calendar, maps, mobile , RSS feeds, category system, tags, an advanced themeing engine, spreadsheet, drawings, inter-user messaging, menus, advanced permission system for users and groups, search engine, external authentication, etc.
Award-winning lightweight Open Source Content Management System (CMS)
PHPFusion is an award-winning open source content management system (CMS).
PHPFusion is written in PHP and MySQL and includes a simple, comprehensive administration system.
Demos : https://demos.php-fusion.co.uk/
Tina4PHP - (This Is Not Another Framework 4 PHP) - A RAD Browser based Development tool with the Cross Database Engine for PHP as its foundation. Manage multiple developers and source on the same web driven application development tool.
iWiccle is an online Web 2.0 platform. innovative builders specializing in social networks, blogging sites, web communities, gallery presentations, link directories, & article portals. A universal web community script written in PHP & MySQL. New v1.3
OPEX is a News, Content and User Management System which uses a User Level system to define privileges for both Anonymous and Registered Users.
It's designed to be simple with no needless extras, thus enabling those who wish to modify the script easily.
PHPscript of LANManWiki allows few manual-writters to work on one manual in the same time in LAN enviroment at the conditions of wiki articles - adding, editing and linking allowed!