- [SPIP](http://www.spip.net/fr) - Publication system for the Internet aimed at collaborative work, multilingual environments, and simplicity of use for web authors. ([Source Code](https://core.spip.net/projects/spip/repository)) `GPL-2.0``PHP`
- [Subrion](http://www.subrion.org) - Subrion is a free open source content management system that allows you to build websites for any purpose. Yes, from blog to corporate mega portal. ([Demo](http://demos.subrion.com), [Source Code](https://github.com/intelliants/subrion)) `GPL-3.0``PHP`
- [Tent](http://secfirst.org/) - Mobile CMS using Markdown files on GitHub as the authoritative data source. [Source Code](https://github.com/securityfirst/tent)) `GPL-3.0``Go`
- [TYPO3](https://typo3.org/) - Powerful and advanced CMS with a large community. ([Source Code](https://github.com/TYPO3/TYPO3.CMS)) `GPL-2.0``PHP`
- [Umbraco](https://umbraco.com/) - The friendly CMS. Free and open source with an amazing community. ([Source Code](https://github.com/umbraco/Umbraco-CMS)) `MIT``.NET`