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Concrete CMS vs MODX Revolution: catalog facts
Concrete CMS	MODX Revolution
Free Free and open source under the MIT licence.	Free Free and open source under the GPL-2.0 licence.
Self-hosted	Self-hosted
Permissive MIT licence Long-running project with legacy branches available	Full control over HTML output and design Supports multi-language and multi-domain sites
Needs a PHP server and Composer to install Older concrete5 sites need upgrading to reach version 9	Requires PHP hosting and some setup Smaller community than the largest PHP CMSes
Self-hosted	Self-hosted
Open source	Open source
License: MIT	License: GPL-2.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.