990 (<1)
question2answer — Question2Answer is a free and open source platform for Q&A sites, running on PHP/MySQL.
Similar Applications Q&A
286 (<1)
phanbook — A Q&A and Forum PHP platform
Similar Applications Forum Q&A
61 (<1)
antispam-bee 2.8.1 — „... another popular solution to fight spam is Antispam Bee“ – Matt Mullenweg, Q&A WordCamp Europe 2014
3 (<1)
moodle-mod_moodleoverflow — :speech_balloon: Non-linear discussion module for Q&A forums
4 (0)
icare-server — A RESTful Q&A system built on top of Symfony2.
6 (0)
ufront-tutorial-Q-A — Basic haxe/ufront tutorial: Question and Answers app
4 (0)
crowd_qa — Crowdsourced Q&A Feature for Drupal
50 (0)
laravel-messenger-bot-management — :smile: Messenger bot Q&A management with Laravel
32 (0)
bronto-api-php-client — PHP Client Library for the Bronto SOAP API, created and maintained by the Bronto Professional Services team. It is free to use, but comes with no official support. However, you may ask questions on the Dev Q&A Forum (http://dev.bronto.com/questions) or contact your Account Manager to discuss a Professional Services engagement for more assistance.
27 (0)
elgg-questions — A Q&A plugin for Elgg (ala Facebook Questions, Quora, Stack Overflow, etc.)

Once a week...

... I send out a list of most interesting PHP libraries and apps.
Want to get it?