- [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`
- [Squidex](http://squidex.io) - Headless CMS, based on MongoDB, CQRS and Event Sourcing. ([Demo](http://cloud.squidex.io), [Source Code](https://github.com/Squidex/squidex)) `MIT``.NET`
- [Strapi](https://strapi.io/) - The most advanced open-source Content Management Framework (headless-CMS) to build powerful API with no effort. ([Source Code](https://github.com/strapi/strapi/)) `MIT``Nodejs`
- [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`