Open Source Microsoft 365 Alternatives

The best open source alternative to Microsoft 365 is LibreOffice. If that doesn't suit you, our users have ranked more than 50 alternatives to Microsoft 365 and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Microsoft 365 are Nextcloud, ONLYOFFICE, Apache OpenOffice and ente Photos.

Microsoft 365 alternatives are mainly Word Processors but may also be Office Suites or Spreadsheet Apps. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of Microsoft 365.

Microsoft 365 alternatives page was last updated

Microsoft 365

Paid • Proprietary
Mail Server

Microsoft 365 is a subscription-based software services that licenses Microsoft Office products for on-premise or...

More about Microsoft 365

LibreOffice
Is this is a good alternative?
Yes
No
Free • Open Source
Office Suite
Spreadsheet App
Word Processor
Mac
Windows
Linux
BSD
Flathub
PortableApps.com
59 LibreOffice alternatives
LibreOffice is a free and open-source office suite that is compatible with other major office suites, and is available on all operating systems. It is an independently-developed version of the OpenOffice.org suite.
- - LibreOffice is the most popular Windows, Mac & Linux alternative to Microsoft 365.
- - LibreOffice is the most popular Open Source & free alternative to Microsoft 365.
Suggest and vote on features
LibreOffice Features
1. Ad-freeLibreOffice doesn't contain any form of external advertising.
2. Works OfflineLibreOffice can be used without the need to connect to the internet.
3. Extensible by Plugins/ExtensionsLibreOffice can be extended with add-ons, plugins and extensions.
4. Spell CheckingLibreOffice can detect and correct all types of grammar and spelling mistakes.
5. PortableLibreOffice can be used from a USB stick or similar with no prior installation.
6. No registration requiredYou can use most of the features in LibreOffice without registration.
7. No TrackingLibreOffice will not track you or use your personal data.
8. Dark ModeLibreOffice supports dark mode for comfortable usage in low light conditions.
9. LightweightLibreOffice consumes less device resources compared to similar apps.
Compatible with Microsoft Office
Print to PDF
Export to Word
GNU/linux-libre
Multiple languages
Community-based
Built-in PDF converter
Export to PDF
Export to office formats
Customizable
Opinions about LibreOffice as a Alternative to Microsoft 365
Almost everyone thinks LibreOffice is a great Microsoft 365 alternative.
Nextcloud
Is this is a good alternative?
Yes
No
Free • Open Source
Cloud Storage Service
File Sync Tool
Online Backup Tool
Mac
Windows
Linux
Online
Android
iPhone
Android Tablet
iPad
Self-Hosted
F-Droid
Cloudron
136 Nextcloud alternatives
You should have full control over your data. We help you achieve that: a safe home for all your data. Secure, under your control and developed in an open, transparent and trustworthy way. We are Nextcloud.
- - Nextcloud is the most popular Web-based, Android, iPhone, iPad, Android Tablet & Self-Hosted alternative to Microsoft 365.
Suggest and vote on features
Nextcloud Features
1. Privacy focusedNextcloud is considered a privacy friendly alternative.
2. Calendar IntegrationNextcloud lets you sync your tasks and events with your calendar application.
3. Ad-freeNextcloud doesn't contain any form of external advertising.
4. Two-factor AuthenticationNextcloud supports two-factor authentication (2FA).
5. Cloud SyncSync your data (notes, documents, bookmarks, etc.) across your different devices and to the cloud.
6. End-to-End EncryptionNextcloud has E2E Encryption, for entire or parts of the app.
7. Extensible by Plugins/ExtensionsNextcloud can be extended with add-ons, plugins and extensions.
8. Dark ModeNextcloud supports dark mode for comfortable usage in low light conditions.
9. FIDO U2F (2FA) supportNextcloud supports FIDO U2F / passwordless / multi-factor authentication.
Sync Contacts
Security focused
On-premises software
Customizable
Hostable
Cross-Platform
CalDAV Support
Integrated File Sharing
Calendar Sync
Integrated Email Client
Comments about Nextcloud as a Alternative to Microsoft 365
Most users think Nextcloud is a great Microsoft 365 alternative.
Dreadfuldark
This is a totally different product. It is not an office suite.
Negative comment•
1

altenativeto
Has a convincing onlyoffice integration. +Better data protection. Feels like 2 Years behind office but works very well in the Browser.
Positive comment•
1

Guest
Only comparable to one tool or service of O365.
Negative comment•
-1
ONLYOFFICE
Is this is a good alternative?
Yes
No
Free Personal • Open Source
Office Suite
Word Processor
Spreadsheet App
Mac
Windows
Linux
Online
Android
iPhone
Android Tablet
iPad
Self-Hosted
AppImageHub
Snapcraft
Flathub
Software as a Service (SaaS)
Flatpak
Cloudron
64 ONLYOFFICE alternatives
ONLYOFFICE is an open-source online collaborative office combining editors for documents, spreadsheets, presentations, and forms. It is compatible with all popular formats and features maximum support for MS Office files.
- - ONLYOFFICE is the most popular SaaS alternative to Microsoft 365.
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ONLYOFFICE Features
1. Works OfflineONLYOFFICE can be used without the need to connect to the internet.
2. Real time collaborationMultiple users can work together in ONLYOFFICE simultaneously.
3. PortableONLYOFFICE can be used from a USB stick or similar with no prior installation.
4. End-to-End EncryptionONLYOFFICE has E2E Encryption, for entire or parts of the app.
5. Dark ModeONLYOFFICE supports dark mode for comfortable usage in low light conditions.
6. Ad-freeONLYOFFICE doesn't contain any form of external advertising.
7. Spell CheckingONLYOFFICE can detect and correct all types of grammar and spelling mistakes.
8. Privacy focusedONLYOFFICE is considered a privacy friendly alternative.
Compatible with Microsoft Office
Tabbed interface
Nextcloud integration
FOSS
Cloud based
Export to PDF
Multiple languages
Collaborative Workspaces
Integrated Youtube support
Built-in translation
Comments about ONLYOFFICE as a Alternative to Microsoft 365
Almost everyone thinks ONLYOFFICE is a great Microsoft 365 alternative.
altenativeto
Probably better team functions and good integration in an environment with higher data protection standards.
Positive comment•
1

Guest
Very goodcompatibility with officeXML files
Positive comment•
1
Apache OpenOffice
Is this is a good alternative?
Yes
No
Free • Open Source
Office Suite
Word Processor
Spreadsheet App
Mac
Windows
Linux
BSD
PortableApps.com
55 Apache OpenOffice alternatives
Apache OpenOffice is a leading open-source office suite that offers free applications for word processing, spreadsheet, presentations, graphics, databases and more. All data is stored in an open standard format, though Open Office can also read and write files from other common...
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Apache OpenOffice Features
1. PortableApache OpenOffice can be used from a USB stick or similar with no prior installation.
2. Syntax HighlightingApache OpenOffice supports syntax highlighting for various programming and markup languages.
3. Works OfflineApache OpenOffice can be used without the need to connect to the internet.
Compatible with Microsoft Office
Built-in PDF converter
Custom templates
Export to PDF
Comments about Apache OpenOffice as a Alternative to Microsoft 365
pros, cons and recent comments
Guest
Office 365 is account management, office suite, storage, and more in a SaaS. OpenOffice is just a desktop office suite.
Negative comment•
0
ente Photos
Is this is a good alternative?
Yes
No
Paid • Open Source
Photo Manager
Photo Sharing App
Cloud Storage Service
Mac
Windows
Linux
Online
Android
iPhone
Android Tablet
iPad
F-Droid
99 ente Photos alternatives
End-to-end encrypted alternative to Google Photos / iCloud Photos, that makes it easy to backup and share photos and videos.
Suggest and vote on features
ente Photos Features
1. Privacy focusedente Photos is considered a privacy friendly alternative.
2. End-to-End Encryptionente Photos has E2E Encryption, for entire or parts of the app.
3. Ad-freeente Photos doesn't contain any form of external advertising.
4. No Trackingente Photos will not track you or use your personal data.
5. Encrypted Backupente Photos uses encryption algorithms to keep your files safe as well as prevent unauthorized access.
6. Cloud SyncSync your data (notes, documents, bookmarks, etc.) across your different devices and to the cloud.
7. Shared Foldersente Photos supports shared folders that can be used to store, search, and access files with multiple people.
8. Two-factor Authenticationente Photos supports two-factor authentication (2FA).
9. Automatic Backupente Photos will automatically back up your data periodically.
Encrypted Photo Storage
Selective Synchronization
Batch Editing
Dark Mode
Built-in viewer
No Logs
AES-256 Encryption
Real time collaboration
File Tagging
Calligra Suite
Is this is a good alternative?
Yes
No
Free • Open Source
Office Suite
Spreadsheet App
Word Processor
Linux
KDE
FreeBSD
44 Calligra Suite alternatives
Calligra Suite is an office and graphic art suite by KDE. It is available for desktop PCs, tablet computers, and smartphones. It contains applications for word processing, spreadsheets, presentation, vector graphics, and editing databases.
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Calligra Suite Features
1. Ad-freeCalligra Suite doesn't contain any form of external advertising.
KDE
Charts
Twake
Is this is a good alternative?
Yes
No
Freemium • Open Source
Team Collaboration Tool
Task Management Tool
Spreadsheet App
Mac
Windows
Linux
Self-Hosted
123 Twake alternatives
Twake is a real-time teamwork platform. It is a suite of collaborative tools that includes the specificities of some bestsellers (Slack, Trello, Google Drive...). We provide professional messaging, storage space, online collaborative editors (Words, Excel, PowerPoint), task...
Suggest and vote on features
Twake Features
1. Real time collaborationMultiple users can work together in Twake simultaneously.
Workspaces
Nextcloud Hub
Is this is a good alternative?
Yes
No
Free • Open Source
Team Collaboration Tool
Calendar App
Document Manager
Self-Hosted
53 Nextcloud Hub alternatives
Nextcloud is the most deployed on-premises file share and collaboration platform. Access & collaborate across your devices. As fully on-premises solution, Nextcloud Hub provides the benefits of online collaboration without the compliance and security risks.
Suggest and vote on features
Nextcloud Hub Features
1. Cloud SyncSync your data (notes, documents, bookmarks, etc.) across your different devices and to the cloud.
2. Ad-freeNextcloud Hub doesn't contain any form of external advertising.
3. Real time collaborationMultiple users can work together in Nextcloud Hub simultaneously.
4. Extensible by Plugins/ExtensionsNextcloud Hub can be extended with add-ons, plugins and extensions.
Photo Gallery
Zimbra Collaboration Suite
Is this is a good alternative?
Yes
No
Freemium • Open Source
Mail Server
Calendar App
Team Collaboration Tool
Linux
Online
Self-Hosted
41 Zimbra Collaboration Suite alternatives
Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more. With the most innovative web application available today, Zimbra boosts the productivity of users on any desktop and dramatically reduces TCO compared to legacy platform vendors.
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Zimbra Collaboration Suite Features
1. Real time collaborationMultiple users can work together in Zimbra Collaboration Suite simultaneously.
ActiveSync
Active Directory integration
Kolab Community
Is this is a good alternative?
Yes
No
Freemium • Open Source
Linux
Online
Self-Hosted
42 Kolab Community alternatives
Kolab is entirely Free and Open Source Software (a.k.a. FOSS), and uses Open Standards. We’ll get to why this is important to us, and hope that it is important to you thereafter.
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Kolab Community Features
1. Real time collaborationMultiple users can work together in Kolab Community simultaneously.
CalDAV Support
WebDAV Support
IMAP Support
CardDAV Support
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