Are there free European authentication tools?

Yes. Zitadel is free or has a free plan, according to the pricing each company publishes. Free plans usually carry limits; each product page links to the company's terms.

Which European authentication tools are open source?

privacyIDEA, Rauthy and Zitadel publish their source code under an open-source licence. Each product page shows the licence and where the code is.

Which European authentication tools can you host yourself?

privacyIDEA, Bare.ID, Rauthy and Zitadel can be run on your own servers, according to their own documentation.

European Authentication Alternatives | European Identity Providers

Authentication alternatives at a glance

European Authentication alternatives compared by country, pricing, free plan, open source and self-hosting
Product	Country	Free plan	Open source	Self-host	Replaces
privacyIDEA	🇩🇪Germany	No	Yes	Yes	Okta
Bare.ID	🇩🇪Germany	No	Not verified	Yes	Auth0, Okta
Rauthy	🇩🇪Germany	No	Yes	Yes	Auth0
Zitadel	🇨🇭Switzerland	Yes	Yes	Yes	Firebase Auth, FusionAuth +2

A dash means we have not verified that attribute. Details and sources are on each product page.

privacyIDEA

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privacyIDEA

privacyIDEA is an open source authentication server designed to enhance security through multi-factor authentication. It supports various authentication methods including OTP, U2F, and SSH keys. The system is modular, written in Python, and can integrate with existing applications like VPNs and web portals. It is enterprise-ready and offers transparency through its open development process on GitHub.

📖Open source🖥️Self-hostable

Replaces

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Bare.ID

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Bare.ID

Bare.ID offers a German self-hostable authentication solution designed for developers seeking control over their identity management. It provides a customizable open-source platform, allowing seamless integration with existing systems while ensuring data privacy and compliance with local regulations.

🖥️Self-hostable

Replaces

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