ONLYOFFICE
Open-source office suite for documents, spreadsheets, and presentations with some of the best Microsoft Office file compatibility around. Registered in Riga, Latvia. Self-host it for free or use the hosted cloud edition.
Quick facts
File compatibility with Word, Excel and PowerPoint documents is some of the closest around, so round-tripping files with Office users rarely breaks formatting. Self-hosting is free and fully open source if you want to run it yourself.
The cloud version's free tier is limited to a handful of users, and collaborative editing feels a step behind Google Docs on very large, simultaneously-edited documents.
Why does it score 72?
Legally registered in Riga, Latvia – a full EU member state.
Held by a Singapore-based holding company rather than an EU/EFTA parent, so it scores 0 here despite the Russian-linked operations having reportedly been spun off in 2019 – worth weighing if sovereignty matters closely to you.
ONLYOFFICE runs its own infrastructure rather than a third-party cloud.
The core editors are fully open source (AGPL) and GDPR-compliant, one of the more thoroughly auditable office suites available.
See how they compare
ONLYOFFICEWhat does it replace?
Microsoft 365 
Google Docs 
Google Sheets 
Microsoft Word 
Microsoft Excel 
Microsoft Powerpoint 
Google Slides More European Office suite alternatives
German office suite from Nuremberg with word processor, spreadsheet, and presentation apps that read and write Microsoft formats natively. A free version, FreeOffice, is also available. Runs offline, so your documents stay on your device.
A complete, free office suite – documents, spreadsheets, presentations – that runs entirely on your own computer. No subscription, no cloud, no tracking.