Add MyBB forum software

README.md

@@ -284,6 +284,7 @@ _[Extensible Messaging and Presence Protocol](https://en.wikipedia.org/wiki/XMPP
   * [Isso](http://posativ.org/isso/) - a lightweight commenting server written in Python and JavaScript. It aims to be a drop-in replacement for Disqus ([Source code](https://github.com/posativ/isso)) `MIT` `Python`
   * [Jappix](https://jappix.com/) - Jappix is an open social platform, that let's you easily get or keep in touch with everyone.
   * [Movim](https://movim.eu/) - A brand new social network, full of awesome features in a modern and smart interface
+  * [MyBB](http://mybb.com) - Free, extensible forum software package. ([Source Code](https://github.com/mybb/mybb)) `LGPLv3` `PHP` 
   * [Newebe](http://newebe.org/) - a Distributed Social Network ([Source code](https://github.com/gelnior/newebe)) `AGPLv3` `Python`
   * [NodeBB](https://nodebb.org/) - Node.js based forum software built for the modern web ([Source code](https://github.com/NodeBB/NodeBB)) `GPLv3` `Node.js`
   * [Oxwall](http://www.oxwall.org/) Oxwall is used for a wide range of projects starting from family sites and custom social networks to collaboration tools and enterprise community solutions. ([Source code](https://bitbucket.org/oxwall/public) `CPALv1` `PHP`