- [Pump.io](http://pump.io/) - Stream server that does most of what people really want from a social network. ([Source Code](https://github.com/pump-io/pump.io)) `Apache-2.0``Nodejs`
- [remark42](https://remark42.com/) - A lightweight and simple comment engine, which doesn't spy on users. It can be embedded into blogs, articles or any other place where readers add comments. ([Demo](https://remark42.com/demo/), [Source Code](https://github.com/umputun/remark42)) `MIT``Go`
- [Satellity](https://satellity.org/) - Yet another open source forum written in Golang, React and PostgreSQL. ([Source Code](https://github.com/satellity/satellity)) `MIT``Go`
- [schnack](https://github.com/schn4ck/schnack) - Schnack is simple self-hosted node app for Disqus-like drop-in commenting on static websites. `LIL-1.0``Node.js`
- [Scoold](https://scoold.com) - Stack Overflow in a JAR. An enterprise-ready Q&A platform with full-text search, SAML, LDAP integration and social login support. ([Demo](https://live.scoold.com), [Source Code](https://github.com/Erudika/scoold)) `Apache-2.0``Java`
- [Simple Machines Forum](https://www.simplemachines.org/) - Free, professional grade software package that allows you to set up your own online community within minutes. ([Source Code](https://github.com/SimpleMachines/SMF2.1)) `BSD-3-Clause``PHP`