> /v1/alternatives/microsoft-365
Open source alternatives to Microsoft 365[006]
Microsoft 365 bundles Word, Excel, PowerPoint, Outlook and OneDrive into a cloud-hosted productivity and collaboration suite. Below are 6 self-hostable open source alternatives, ranked by GitHub popularity.
CryptPad
Collaborative office suite, end-to-end encrypted and open-source.
★ STARS
7.6k
⑂ FORKS
818
Tuta
Tuta is an email service with a strong focus on security and privacy that lets you encrypt emails, contacts and calendar entries on all your devices.
★ STARS
7.6k
⑂ FORKS
616
onlyoffice-docs
ONLYOFFICE Docs is a free collaborative online office suite comprising viewers and editors for texts, spreadsheets and presentations, forms and PDF, fully compatible with Office Open XML formats: .docx, .xlsx, .pptx and enabling…
★ STARS
6.5k
⑂ FORKS
1.3k
Papra
The minimalistic document archiving platform.
★ STARS
4.4k
⑂ FORKS
214
LibreOffice
Read-only LibreOffice core repo - no pull request (use gerrit instead - don't download zip, use instead
★ STARS
3.9k
⑂ FORKS
832
collabora-online
Collabora Online is a collaborative online office suite based on LibreOffice technology. This is also the source for the Collabora Office apps for iOS and Android.
★ STARS
3.2k
⑂ FORKS
1.0k
// EDITOR'S TAKE
LibreOffice covers the desktop half convincingly but has no cloud story of its own, so for browser-based co-editing with the best .docx and .xlsx fidelity, onlyoffice-docs and collabora-online are the two that genuinely compete, and both expect you to bring your own file storage. CryptPad trades some format compatibility for end-to-end encryption.
// FREQUENTLY ASKED
What is the best open source Microsoft 365 alternative?
CryptPad is the most popular open source Microsoft 365 alternative by GitHub stars (7,619 stars). The other 5 options are ranked above.
Are these Microsoft 365 alternatives self-hostable?
Yes — every project listed here is open source and runs on your own infrastructure. Click into a project to see its license, stars, language, and current health status.
Are they free?
All projects shown are free and open source. Check each project's license page for the terms — most are MIT, Apache 2.0, or AGPL.