Write documents, edit spreadsheets and create presentations on your desktop.
Free and open source (MPL-2.0).
Writing & clarity
Collabora Online
Free optionOpen sourceBrowser
Collaborate on documents, spreadsheets and presentations in your browser.
What you can use it for
Collaborate on documents, spreadsheets and presentations in your browser.
- Covers the core everyday task of Microsoft 365: documents, spreadsheets and slides.
- 3.4k GitHub stars; last commit 2026-10-09.
Workflow coverage and comparison notes
Collaborative real-time editing of docx, xlsx and pptx documents in the browser via self-hosted Collabora Online instead of a Microsoft 365 subscription.
Before you switch
Self-hosted: requires a server, Docker/Kubernetes, and integration with Nextcloud or ownCloud for document storage and authentication.
Alternatives to these paid apps
Each comparison covers the workflow described above, rather than every paid feature.
More for the same workflow
See alternatives →
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