EU Sovereignty Score
Self-hosted / open sourceScheduling & BookingHeadquarters: FR

GRR: sovereignty score and 8 European alternatives

GRR (Gestion et Réservation de Ressources) is an open-source web application for booking shared resources such as meeting rooms, vehicles, equipment or staff. Organisations install the PHP application with a MySQL database on their own server, and staff make reservations through a responsive web interface. GRR is an adaptation of the MRBS project. According to the README, the 4.5.x series is currently supported and PHP 8.1 to 8.5 is required.

GRR is maintained by DEVOME, a French business in Saint-Augustin in the Hauts-de-France region, which took over the project in 2014. The source code is on GitHub under the GPL-2.0, marked Copyright Team DEVOME. Besides the free program, DEVOME sells a cloud subscription, MyGRR, and an iCal export module in its online shop; the hosting location of the cloud offer is not published. If you run GRR yourself, the calendar and user data stay on your own infrastructure.

See the 8 European alternatives ↓Assess your stack with GRR pre-selected
MastodonLinkedInBlueskyXEmail
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 14, 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
Category
Scheduling & Booking
Type
Product
Website
site.devome.com ↗

How we verify · Something wrong? Suggest a correction

Top EU-based & GDPR-compliant alternatives to GRR

The European alternatives to GRR come from our knowledge base of over 8,400 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

63 European Scheduling & Booking vendors are in the catalogue. View the whole category · Submit an alternative · View category on the map

Is GRR one of many dependencies?

Score your whole stack in about three minutes. Free, no account needed.

Assess your stack →View a sample report (opens in a new tab)

Why digital sovereignty matters with GRR

GRR 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 GRR scores best on data residency.

GRR 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 GRR 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 GRR?

It depends on your use case. Strong EU alternatives to GRR include Agendize, Aïkku PLANN and aleno. On this page you can compare 8 EU alternatives by jurisdiction, data residency and open-source status.

Are there open-source alternatives to GRR?

Yes. Open-source EU alternatives to GRR include Aïkku PLANN and Baïkal. These keep your data fully under your own control and let you self-host if you want to.

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

GRR is headquartered in FR (EU) and hosts data in EU. It is also open-source, so you can self-host it. That makes GRR 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 14, 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

In the changelog

Earlier changes to this page, as listed in the public changelog.

Digital sovereignty in Scheduling & Booking

Scheduling & Booking: Appointment scheduling, online booking systems and calendar management. 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

See all →
Open in the alternatives dashboardMissing a vendor? Submit itAre you this vendor? You can also become a sponsor on the Scheduling & Booking page — with no effect on your score
8 European alternatives to GRR — GDPR-compliant & EU-hosted · EU Sovereignty Score