The Best Open Source Microsoft 365 Copilot AlternativesTop Word Processors & Office Suites like Microsoft 365 Copilot

The best open source alternative to Microsoft 365 Copilot is LibreOffice. If that doesn't suit you, our users have ranked more than 50 alternatives to Microsoft 365 Copilot and 14 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Microsoft 365 Copilot are ONLYOFFICE, Apache OpenOffice, CryptPad and Proton Docs.

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Microsoft 365 Copilot alternatives are mainly Office Suites, but if you're looking for Word Processors or Spreadsheet Apps you can filter on that. Other popular filters include Paid, Android + Open Source, Word Processing, Windows + Free, Linux, Open Source and Windows. You can also filter by region, for example EU-based alternatives if you prefer software developed in the European Union. These are just examples - use the filter bar below to find more specific alternatives to Microsoft 365 Copilot.
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Alternatives list

  1. LibreOffice icon

    LibreOffice

     3101 likes
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    Comprehensive free office suite supporting word processing, advanced spreadsheets, dynamic presentations, vector drawings, math formulas, and robust database management. Fully compatible with major office formats across all operating systems, it offers extensive capabilities for personal or professional tasks.

    52 LibreOffice alternatives

    Cost / License

    • Free
    • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • BSD
    • Snapcraft
    • Flathub
    • PortableApps.com
    • F-Droid
    • Flatpak
    LibreOffice Writer on Linux
     
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    58
    799
    Comments about LibreOffice as an Alternative to Microsoft 365 Copilot
    Comment summary: LibreOffice is widely praised for being a free, open-source alternative to Microsoft 365, offering compatibility with Microsoft file formats and a robust feature set. However, some users face UI/UX challenges and document formatting issues, especially with complex elements. While many appreciate its open-source nature and resource efficiency, others highlight its outdated interface and slower performance compared to Microsoft's suite.
    Top Positive Comment
    Korwin
    3

    Free, Windows, full Microsoft Office (.doc, .xls), Microsoft Office Open XML, OpenDocument, and Portable Document Format support.

    Top Negative Comment
    Sam Lander
    3

    LibreOffice does basically everything you can do in Microsoft, and it's open source and doesn't constantly try to call home.

    Plus, LibreOffice is free.

    wouf336
    Negative
    1

    Really bad UI and UX, no cloud save, no collaboration tools, use this of you wanna flashback to early 2010s

    Show more comments
    3 of 58 comments
    Microsoft 365 Copilot Icon
    LibreOffice icon

    • Almost everyone thinks LibreOffice is a great Microsoft 365 Copilot alternative.

    • LibreOffice is the most popular Windows, Android, Mac & Linux alternative to Microsoft 365 Copilot.

    • LibreOffice is the most popular Open Source & free alternative to Microsoft 365 Copilot.

    • LibreOffice is Free and Open SourceMicrosoft 365 Copilot is Freemium and Proprietary
    • LibreOffice is Customizable, Privacy focused and LightweightMicrosoft 365 Copilot is not according to our users
  2. ONLYOFFICE icon

    ONLYOFFICE

     636 likes
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    Open-source office suite offering document, spreadsheet, and presentation editing with co-editing modes, plugin support, integration across 30+ services, robust security, and mobile access. Available in Community, Enterprise, and Home Server editions for versatile deployment.

    72 ONLYOFFICE alternatives

    Cost / License

    • Free Personal
    • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • Android Tablet
    • HUAWEI AppGallery
    • iPad
    • Self-Hosted
    • AppImageHub
    • Snapcraft
    • Flathub
    • Samsung Galaxy Store
    • Software as a Service (SaaS)
    • Flatpak
    • Cloudron
    ONLYOFFICE screenshot 1
     
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    22
    141
    Comments about ONLYOFFICE as an Alternative to Microsoft 365 Copilot
    Comment summary: ONLYOFFICE is widely praised as a free and open-source alternative to Microsoft 365 (Office), providing strong compatibility with Microsoft Office formats. Users appreciate its modern design, fast performance, and versatility across platforms, including Linux. While some note it lacks a few features, its user interface and formatting capabilities generally surpass those of LibreOffice.
    Top Positive Comment
    Jatan Mehta
    9

    Doesn't mess up formatting like LibreOffice does.

    social-remodeler
    Positive
    0

    It is not proprietary software.

    nguyenkhoi-luong-56
    Positive
    0

    It's free and open source software. Compatible with most Microsoft Office documents. Doesn't track you at all.

    Show more comments
    3 of 22 comments
    Microsoft 365 Copilot Icon
    ONLYOFFICE icon

    • Almost everyone thinks ONLYOFFICE is a great Microsoft 365 Copilot alternative.

    • ONLYOFFICE is the most popular Web-based, iPhone, iPad, SaaS, Android Tablet & Self-Hosted alternative to Microsoft 365 Copilot.

    • ONLYOFFICE is Free Personal and Open SourceMicrosoft 365 Copilot is Freemium and Proprietary
    • ONLYOFFICE is Privacy focusedMicrosoft 365 Copilot is not according to our users
  4. Apache OpenOffice icon

    Apache OpenOffice

     811 likes
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    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...

    57 Apache OpenOffice alternatives

    Cost / License

    • Free
    • Open Source

    Application types

    Alerts

    • Discontinued

    Platforms

    • Mac
    • Windows
    • Linux
    • BSD
    • PortableApps.com
    Apache OpenOffice screenshot 1
     
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    6
    130
    Comments about Apache OpenOffice as an Alternative to Microsoft 365 Copilot
    Top Positive Comment
    Guest
    11

    Free, no ads like many other "free" programs, and open source.

    Review by a new / low-activity user.
    Top Negative Comment
    bchpls
    7

    Don't use it! Apache OpenOffice is a dead project. For many years there's been no real serious updates to the project.

    KuboFHromoslav
    Negative
    0

    OpenOffice was a great alternative when it was in really active development. But for more than a decade it stands on the same place without meaningful movement and it is very unfortunate. Rather use LibreOffice, which stands on the great legacy of OpenOffice but is in active development.

    Show more comments
    3 of 6 comments
    Microsoft 365 Copilot Icon
    Apache OpenOffice icon

    • Most users think Apache OpenOffice is a great Microsoft 365 Copilot alternative.

    • Apache OpenOffice is Free and Open SourceMicrosoft 365 Copilot is Freemium and Proprietary
  5. Ad
    Screenshot
    Proton Docs icon
    Proton Docs

    Docs in Proton Drive are end-to-end encrypted so your work stays safe from data breaches, online surveillance, and can never be fed into AI models.

    https://proton.me
    Learn More
  6. CryptPad icon

    CryptPad

     169 likes
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    CryptPad is a private-by-design alternative to popular office tools and cloud services. All the content stored on CryptPad is encrypted before being sent, which means nobody can access your data unless you give them the keys.

    73 CryptPad alternatives

    Cost / License

    • Freemium (Subscription)
    • Open Source

    Application types

    Platforms

    • Software as a Service (SaaS)
    • Self-Hosted
    • Cloudron
    Instance homepage
     
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    2
    17
    Comments about CryptPad as an Alternative to Microsoft 365 Copilot
    Shaz Shah
    Positive
    0

    I like Cryptpad as an alternative to M365, where it allows you to self-host your own office suite, which looks like an instance of OnlyOffice hosted in the "cloud" while respecting E2EE and is open source. If you'd rather use the cloud than self-host you can use a public instance or a paid plan for hosting and storage.

    kaspian
    Positive
    0

    Great thing to selfhost, it uses E2EE

    Microsoft 365 Copilot Icon
    CryptPad icon

    • Almost everyone thinks CryptPad is a great Microsoft 365 Copilot alternative.

    • CryptPad is Freemium and Open SourceMicrosoft 365 Copilot is Freemium and Proprietary
    • CryptPad is Privacy focused and LightweightMicrosoft 365 Copilot is not according to our users
  8. Collabora Office Classic icon

    Collabora Office Classic

     62 likes
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    On-premise office suite featuring advanced word processing, spreadsheets, and presentations, unmatched compatibility with 100+ formats, OOXML support, six-month updates, enterprise hardening, Visio and Publisher import, PDF export, and support for 50+ languages.

    40 Collabora Office Classic alternatives

    Cost / License

    • Freemium (Pay once or Subscription)
    • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • Chrome OS
    • Android Tablet
    • iPad
    • Self-Hosted
    • Software as a Service (SaaS)
    • Cloudron
    • Flathub
    • Flatpak
    Collabora Office Classic screenshot 1
     
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    11
  10. Calligra Suite icon

    Calligra Suite

     100 likes
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    Calligra Suite is an office and graphic art suite by KDE. It contains applications for word processing, spreadsheets, presentation, vector graphics, and editing databases.

    Cost / License

    • Free
    • Open Source

    Application types

    Platforms

    • Linux
    • KDE Plasma
    • FreeBSD
    • Flathub
    • Flatpak
    Calligra Suite screenshot 1
     
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    1
    24
    Comments about Calligra Suite as an Alternative to Microsoft 365 Copilot
    Shaz Shah
    0

    Calligra Suite's interface kinda resembles iWork (is it still called that?), which would come as a shock to those coming from Office. Unfortunately, I didn't have a stable experience using it on my device running Zorin OS. It also lacks collaborative features.

    Microsoft 365 Copilot Icon
    Calligra Suite icon

    • Most users think Calligra Suite is a great Microsoft 365 Copilot alternative.

    • Calligra Suite is Free and Open SourceMicrosoft 365 Copilot is Freemium and Proprietary
    • Calligra Suite is Privacy focused and LightweightMicrosoft 365 Copilot is not according to our users
  11. ZetaOffice icon

    ZetaOffice

     8 likes
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    Experience LibreOffice in your browser with ZetaOffice, featuring device access, self-hosting or CDN deployment, API for tailored integration, and data control. Enjoy a comprehensive suite with Writer for formatting, Calc for data analysis, and Impress for presentations, optimized for performance.

    50 ZetaOffice alternatives

    Cost / License

    • Free
    • Open Source

    Application types

    Platforms

    • Windows
    • Linux
    • Online
    • Self-Hosted
    • Flathub
    • Flatpak
    ZetaOffice screenshot 1
     
  12. Collabora Online icon

    Collabora Online

     13 likes
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    Collabora Online is a powerful LibreOffice-based online office suite with collaborative editing, which supports all major document, spreadsheet and presentation file formats and works in all modern browsers.

    24 Collabora Online alternatives

    Cost / License

    • Subscription
    • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • Chrome OS
    • Android Tablet
    • iPad
    • Self-Hosted
    • Software as a Service (SaaS)
    • Cloudron
    With live video collaboration. Using Talk in the right side bar.
     
  13. Kolab icon

    Kolab

     43 likes
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    Kolab provides a FOSS communication & collaboration solution that can be completely self-hosted. Take back control of your data and access it via the webinterface, or existing mobile & desktop clients.

    Cost / License

    • Freemium (Subscription)
    • Open Source

    Application type

    Platforms

    • Linux
    • Online
    • Self-Hosted
     
  14. Open365 icon

    Open365

     30 likes
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    The open source cloud with LibreOffice online - LibreOffice online + Seafile + KDE. Improve your productivity and communicate better with your team members. The world is moving forward. Welcome to the open source cloud!.

    Cost / License

    • Free
    • Open Source

    Application types

    Alerts

    • Discontinued

    Platforms

    • Android
    • Self-Hosted
    Open365 screenshot 1
     
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    9
  15. NeoOffice icon

    NeoOffice

     47 likes
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    NeoOffice is an office suite for Mac that is based on OpenOffice and LibreOffice. With NeoOffice, you can view, edit, and save OpenOffice documents, LibreOffice documents, and simple Microsoft Word, Excel, and PowerPoint documents.

    Cost / License

    • Free
    • Open Source

    Application types

    Alerts

    • Discontinued

    Platforms

    • Mac
    NeoOffice screenshot 1
     
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    1
    7
    Comments about NeoOffice as an Alternative to Microsoft 365 Copilot
    maurosoft391
    Negative
    1

    not compatble with windows and linux

    Microsoft 365 Copilot Icon
    NeoOffice icon

    • Most users think NeoOffice is a great Microsoft 365 Copilot alternative.

    • NeoOffice is Free and Open SourceMicrosoft 365 Copilot is Freemium and Proprietary
12 of 14 Microsoft 365 Copilot alternatives