> For the complete documentation index, see [llms.txt](https://astrumkb.gitbook.io/kb/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://astrumkb.gitbook.io/kb/platforms-web/sitebuilders/modx.md).

# MODX

MODX is a free and open-source content management system (CMS) and web application framework that allows users to create, manage, and publish websites and web applications. MODX is a flexible and highly customizable platform that can be used to build a variety of web projects, from simple blogs and brochure sites to complex e-commerce and enterprise-level web applications.


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