ONLYOFFICE

Docs, sheets and slides with high fidelity for .docx/.xlsx/.pptx. Made by Ascensio System (Latvia); integrates with Nextcloud and others.

Based in: Riga, Latvia
Licence: AGPL-3.0 (open source)
Hosting: both
Data residency: Self-host on your own servers, or use their EU cloud.
Free tier: Free - Community/Personal edition; self-hosting is free.
Paid from: Paid cloud and enterprise plans available.
Best for: Teams wanting a self-hostable office suite with strong MS Office format compatibility.
Alternative to: Google Workspace, Microsoft 365

Sources: www.onlyoffice.com (Mon Jul 06 2026 00:00:00 GMT+0000 (Coordinated Universal Time))