EU Sovereignty Score
Self-hosted / open sourceCMSHeadquarters: DE

OpenCms: sovereignty score and 8 European alternatives

OpenCms is an open-source content management system written in Java and XML, used to build and manage websites. The software is distributed as a download and as a Docker image, so organisations run it on their own infrastructure. The core of the project is released under the LGPL-2.1 licence.

OpenCms is developed by Alkacon Software GmbH & Co. KG in Cologne, Germany, which also provides support, training and consultancy for the product. The company is established in the European Union. Because the software runs on the organisation's own infrastructure, the organisation decides where its data is stored. For a European organisation this offers an open and inspectable base, with operation, hosting and security updates kept under its own control or that of a partner it chooses.

See the 8 European alternatives ↓Assess your stack with OpenCms pre-selected
Sovereignty score
94 / 1000 = high exposure
100 = sovereign
  • Jurisdiction SOV-2100
    Headquartered in the EU: European law applies
  • Data residency SOV-3100
    EU-only hosting
  • Cryptographic key sovereignty SOV-390
    Self-hostable: encryption keys under your own control
  • Freedom from lock-in SOV-680
    Open source: low switching costs
  • Source & runtime sovereignty SOV-4 · SOV-6100
    Source code auditable, forkable and self-hostable

SOV codes: the matching objective in the European Commission's Cloud Sovereignty Framework. Official source

How the score is calculated

Facts and evidence

Last checked October 10, 2026
HeadquartersDE (EU)Verified by hand
Sovereignty modelOpen-source, distributedVerified by hand
Data hostingEUVerified by hand
Open-sourceYesVerified by hand
GDPR-compliantNoVendor-stated
CategoryCMS
TypeProduct
Websiteopencms.org ↗

How we verify · Something wrong? Suggest a correction

Top EU-based & GDPR-compliant alternatives to OpenCms

The European alternatives to OpenCms come from our knowledge base of over 6,200 vendors. We only list vendors headquartered in the EU or the EEA; fully European-owned vendors rank before vendors with a foreign owner. For each alternative you see the country, the open-source status and a short description.

Score per alternative: 0 = high exposure, 100 = sovereign

39 European CMS vendors are in the catalogue. View the whole category · Submit an alternative · View category on the map

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Why digital sovereignty matters with OpenCms

OpenCms is headquartered in DE and therefore falls under European law: the GDPR, NIS2 and the Data Act. No foreign legislation can compel access to your data.

Data is hosted exclusively in the EU, so OpenCms scores best on data residency.

OpenCms is open source. You can audit the source code, self-host the software and keep the encryption keys under your own control. Switching is easier because data and software are not tied to a single party.

What this means for your organisation depends on your whole stack and context. The free assessment weighs OpenCms together with your other vendors and gives a total score, a heatmap and the main risk drivers.

Frequently asked questions

What is the best European alternative to OpenCms?

It depends on your use case. Strong EU alternatives to OpenCms include Ametys, Bolt CMS and caisy. On this page you can compare 8 EU alternatives by jurisdiction, data residency and open-source status.

Are there open-source alternatives to OpenCms?

Yes. Open-source EU alternatives to OpenCms include Ametys, Bolt CMS, Cockpit CMS, Contao and django CMS. These keep your data fully under your own control and let you self-host if you want to.

Is OpenCms GDPR-compliant and where is the data hosted?

OpenCms is headquartered in DE (EU) and hosts data in EU. It is also open-source, so you can self-host it. That makes OpenCms an EU-sovereign choice in its own right; the EU alternatives on this page are comparable European tools.

Details and sources

Verified by handHeadquarters, owner, hosting locations and licence have been checked by us against public sources. Free of charge and for every vendor, not a paid label. Nothing in this knowledge base is taken over automatically. Last checked on October 10, 2026.

Sources

Public sources used in the latest check of this record.

Compliance evidence

The links below point to the vendor's own public documents. We only record what we found: a missing link means "not found publicly", not "not compliant".

No public compliance evidence has been recorded for this vendor yet. Do you know its DPA or subprocessor list? Something wrong? Suggest a correction

Cyber Resilience Act

Public signals that relate to the EU Cyber Resilience Act. They do not count towards the score. A missing line means "not found publicly".

We found none of these signals on the vendor's own site when we checked.

For products in scope of the CRA, CE marking is required from 11 December 2027; this cannot be checked yet.

Checked on October 10, 2026. What is the Cyber Resilience Act?

Digital sovereignty in CMS

CMS: Content management systems — websites, headless CMS, digital experience platforms. In this category the choice of vendor determines who has legal access to your data, where that data lives and how easily you can switch later.

Also in this category

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8 European alternatives to OpenCms — GDPR-compliant & EU-hosted · EU Sovereignty Score