Features: Online document editors, platform for document management, corporate communication, mail and project management tools. Read more: Data Security & Access Control - Total control over data security.
Official website onlyoffice.com
Our take
If your actual problem is Microsoft Office compatibility without handing files to Microsoft, this handles .docx and .xlsx more faithfully than most open alternatives. Note the encryption framing: it protects data in transit and storage on a server you control, it is not the browser-side zero-knowledge model of CryptPad. Self-host it for a team that lives in Office formats; if you mainly want client-side encryption, this is not that tool.
GitHub at a glance
ONLYOFFICE/DocumentServer
Stars
6,624
+ 35 this week
Last commit
3d ago
healthy
License
AGPL-3.0
Latest release
v9.4.0
1mo ago
Stars, last 10d
Listed in
ONLYOFFICE alternatives
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CryptPad Plenty of features: Rich text, code, presentation, sheet, form, kanban, whiteboard and CryptDrive. Encrypted data is hosted in France but you can also self-host it or select…
LibreOffice LibreOffice consists of programs for word processing, creating and editing of spreadsheets, slideshows, diagrams and drawings, working with databases, and composing…
Etherpad Highly customizable open-source online editor providing collaborative editing in real time.
EtherCalc Your data is saved on the web, and people can edit the same document at the same time. Everybody's changes are instantly reflected on all screens.
Vikunja The project is still under development and the native apps are not final yet, but the web version works great. Offers an import feature from Todoist, Trello and Microsoft To-Do.
ONLYOFFICE license, in plain English
AGPL-3.0 Strong copyleft · network
Free to use, even commercially. Changes must be published under the same license, and running a modified version as a network service counts as distributing it.
Permits
- Commercial use
- Modification
- Distribution
- Patent use
- Private use
Requires
- Disclose source
- Network use is distribution
- Same license
- State changes
- License and copyright notice
Does not provide
- Liability cover
- Warranty
Why it matters: The network clause is the point. Anyone who runs a modified version as a hosted service has to publish those changes, so the code handling your data stays inspectable. This is why privacy-first projects reach for AGPL.
Plain-language summary of the project's license, not legal advice. Read the full text for the exact terms.