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OpenCms

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description OpenCms Overview

OpenCms is an open-source, web content management system initially developed in Germany, notable for its focus on workflow automation and robust permissioning features, now maintained as a “ghost CMS” with limited active development support.

help OpenCms FAQ

Is OpenCms still an open-source Java CMS, or is it only a legacy product?

OpenCms is still an open-source Java CMS distributed by Alkacon Software under the GNU LGPL. Its current project documentation lists Java 21 and Java 25 compatibility, so it is not simply an abandoned archive. ([OpenCms source repository](https://github.com/alkacon/opencms-core))

How does OpenCms stop an editor's draft from appearing on the live site?

OpenCms uses an Online and Offline workflow in which changes can be reviewed and approved before publication. Its permission system lets administrators control which users can edit, approve, or publish content. ([OpenCms source repository](https://github.com/alkacon/opencms-core))

What is the Mercury Template in OpenCms?

Mercury is the modular template shipped with OpenCms by default. It uses Bootstrap 5 and supports drag-and-drop page layouts, reusable content elements, and multilingual presentation. ([Mercury Template documentation](https://www.opencms.org/en/news/211012-opencms-1200-releasenotes.html))

Does OpenCms have a headless API for another frontend?

Yes. OpenCms 12 introduced a headless JSON API for REST-based content access, which can support JavaScript applications or another frontend. The exact API surface depends on the OpenCms version and installed modules. ([OpenCms release information](https://www.opencms.org/en/index.html?page=10))

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