* [phpBB](https://www.phpbb.com/) - Flat-forum bulletin board software solution that can be used to stay in touch with a group of people or can power your entire website. ([Source Code](https://github.com/phpbb/phpbb)) `GPLv2``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`
* [Reddit](https://www.reddit.com/r/redditdev/) - 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`