Self-hosted / open sourceIdentityHeadquarters: FR

LemonLDAP::NG: sovereignty score and 8 European alternatives

LemonLDAP::NG is free software for web single sign-on and access management. It handles authentication through LDAP, Active Directory, Kerberos, databases, CAS, SAML and OpenID Connect, among others, and can itself act as an identity provider for CAS, SAML 2.0 and OpenID Connect. Authorisation uses access rules based on attributes and groups, and user identity is recorded in logs. Second factors include TOTP, WebAuthn and email. The system consists of a portal, a manager for administration and optional handlers for Nginx, Apache and other web servers.

The project is installed yourself, from packages for Debian, Ubuntu, RHEL and SUSE, with Docker or from a tarball. No vendor hosts your data: sessions and configuration reside on your own infrastructure. The project website is hosted by Worteks and its code forge is run by OW2. LemonLDAP::NG is FranceConnect certified and follows the OpenID Connect guidelines of the French security agency ANSSI. Installation, administration and maintenance require in-house expertise.

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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 July 2, 2026

Headquarters	FR (EU)Verified by hand
Sovereignty model	Open-source, distributedVerified by hand
Data hosting	EUVerified by hand
Open-source	YesVerified by hand
GDPR-compliant	YesVendor-stated
Compliance documents	1 published, see belowVendor-stated
Hosting signal	COGENT-174 - Cogent Communications, LLC, US (US)Technically measured
Category	Identity
Type	Product
Website	lemonldap-ng.org ↗

The hosting signal shows the network that serves the vendor's website, often a CDN, and not necessarily where the service or your data is hosted. How we verify · Something wrong? Suggest a correction

Top EU-based & GDPR-compliant alternatives to LemonLDAP::NG

The European alternatives to LemonLDAP::NG come from our knowledge base of over 6,800 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

58 European Identity 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 LemonLDAP::NG

LemonLDAP::NG is headquartered in FR 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 LemonLDAP::NG scores best on data residency.

LemonLDAP::NG 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 LemonLDAP::NG 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 LemonLDAP::NG?

It depends on your use case. Strong EU alternatives to LemonLDAP::NG include Adnovum, Airlock and Auðkenni. On this page you can compare 8 EU alternatives by jurisdiction, data residency and open-source status.

Are there open-source alternatives to LemonLDAP::NG?

Our list of EU alternatives to LemonLDAP::NG is mostly commercial options. Browse the category on the map for open-source choices.

Is LemonLDAP::NG GDPR-compliant and where is the data hosted?

LemonLDAP::NG is headquartered in FR (EU) and hosts data in EU. It is also open-source, so you can self-host it. That makes LemonLDAP::NG 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 July 2, 2026.

Sources

This record was checked via the vendor's website and legal notice during the full audit of June and July 2026. Source links have been recorded per record since 20 September 2026.

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".

Security page / trust center: lemonldap-ng.org/GPG-KEY-LLNG-SECURITY.asc

Provenance of the links above:Vendor-stated

Links checked on September 21, 2026.

Digital sovereignty in Identity

Identity: Identity and access management — SSO, MFA, directory services. 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.

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