* [FluxBB](http://fluxbb.org/) - Fast, light, user-friendly forum software for your website. ([Source Code](https://github.com/fluxbb/fluxbb)) `GPLv2``PHP`
* [Friendica](http://friendica.com/) - Social Communication Server. ([Source Code](https://github.com/friendica/friendica)) `AGPLv3``PHP`
* [GNU social](https://gnu.io/social/) - Social communication software for both public and private communications. ([Source Code](https://git.gnu.io/gnu/gnu-social)) `AGPLv3``PHP`
* [Hubzilla](https://github.com/redmatrix/hubzilla) - Independent general-purpose websites that not only connect with their associated members and viewers, but also connect together.`MIT``PHP`
* [HumHub](https://www.humhub.org/) - A flexible kit for private social networks. ([Source Code](https://github.com/humhub/humhub)) `AGPLv3``PHP`
* [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. ([Source Code](https://github.com/jappix/jappix)) `AGPLv3``PHP`
* [PPnet](https://github.com/pixelpark/ppnet) - Create and host your own social network. `MIT``Javascript`
* [Pump.io](http://pump.io/) - Stream server that does most of what people really want from a social network. ([Source Code](https://github.com/e14n/pump.io)) `Apache``Nodejs`
* [Reddit](https://www.reddit.com/) - Social networking and news website where registered community members can submit content. ([Demo](https://www.reddit.com/), [Source Code](https://github.com/reddit/reddit)) `CPALv1``Python`
* [Symphony](https://hacpai.com/) - A modern community (forum/SNS/blog) platform written in Java. ([Source Code](https://github.com/b3log/symphony)) `GPLv3``Java`
* [Telescope](http://www.telescopeapp.org/) - An open-source social news app built with Meteor. ([Demo](http://demo.telescopeapp.org/), [Source Code](https://github.com/TelescopeJS/Telescope)) `MIT``Nodejs`