Open365 AlternativesOffice Suites & Email Clients like Open365

Open365 is described as '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!' and is a Office Suite in the office & productivity category. There are more than 25 alternatives to Open365 for a variety of platforms, including Windows, Web-based, Android, iPhone and Linux apps. The best Open365 alternative is LibreOffice, which is both free and Open Source. Other great apps like Open365 are ONLYOFFICE, Microsoft 365 Copilot, Apache OpenOffice and CryptPad.

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Alternatives list

  1. LibreOffice icon

    LibreOffice

     3094 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
     

    • LibreOffice is the most popular Windows, Android, Mac & Linux alternative to Open365.

    • LibreOffice is the most popular Open Source & free alternative to Open365.

    • LibreOffice is Free and Open SourceOpen365 is also Free and Open Source
    • LibreOffice is Customizable, Privacy focused and LightweightOpen365 is not according to our users
  2. ONLYOFFICE icon

    ONLYOFFICE

     628 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.

    70 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
     

    • ONLYOFFICE is the most popular Web-based, iPhone, iPad, SaaS, Android Tablet & Self-Hosted alternative to Open365.

    • ONLYOFFICE is Free Personal and Open SourceOpen365 is Free and Open Source
    • ONLYOFFICE is Privacy focusedOpen365 is not according to our users
  4. Microsoft 365 Copilot icon

    Microsoft 365 Copilot

     854 likes
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    Office suite offering productivity tools, document creation, and collaboration. Features AI-enhanced editing, mobile app access to documents and shared workspaces. Formats include word processing, spreadsheets, presentations, and email services.

    52 Microsoft 365 Copilot alternatives

    Cost / License

    • Freemium (Pay once or Subscription)
    • Proprietary

    Application types

    Platforms

    • Mac
    • Windows
    • Online
    • Android
    • iPhone
    • Android Tablet
    • HUAWEI AppGallery
    • iPad
    Microsoft 365 Copilot screenshot 1
     
  5. Ad
    Screenshot
    ONLYOFFICE icon
    ONLYOFFICE

    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...

    https://www.onlyoffice.com
    Learn More
  6. Apache OpenOffice icon

    Apache OpenOffice

     810 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...

    56 Apache OpenOffice alternatives

    Cost / License

    • Free
    • Open Source

    Application types

    Alerts

    • Discontinued

    Platforms

    • Mac
    • Windows
    • Linux
    • BSD
    • PortableApps.com
    Apache OpenOffice screenshot 1
     
  7. CryptPad icon

    CryptPad

     166 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.

    72 CryptPad alternatives

    Cost / License

    • Freemium (Subscription)
    • Open Source

    Application types

    Platforms

    • Software as a Service (SaaS)
    • Self-Hosted
    • Cloudron
    Instance homepage
     
  8. WPS Office icon

    WPS Office

     398 likes
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    A comprehensive, free office suite offering high compatibility across formats. Supports Android, iOS, Windows, Linux, macOS, and handles text, presentations, spreadsheets, and PDFs. Features document collaboration, multiple languages, strong privacy, and user support.

    51 WPS Office alternatives

    Cost / License

    • Freemium (Subscription)
    • Proprietary

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • Chrome OS
    • Android Tablet
    • iPad
    • Flathub
    • Flatpak
    All in one
     
  10. Microsoft Outlook icon

    Microsoft Outlook

     397 likes
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    Streamline emails, calendars, contacts, and task management with a smart inbox prioritizing critical messages. Includes calendar scheduling, third-party app integration like Facebook, Dropbox, and Trello, and support for Microsoft Exchange, Outlook.com, and Gmail, ensuring efficient task and email handling.

    126 Microsoft Outlook alternatives

    Cost / License

    • Pay once or Subscription
    • Proprietary

    Application types

    Platforms

    • Mac
    • Windows
    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Apple Watch
    • Android Wear
    Outlook 365 on Windows
     

    • Microsoft Outlook is the most popular commercial alternative to Open365.

    • Microsoft Outlook is Paid and ProprietaryOpen365 is Free and Open Source
  11. Apple Mail icon

    Apple Mail

     244 likes
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    Access, view and manage messages from all your email accounts in one place. Categorize your messages into easy to browse categories. Catch up on email easily with Apple Intelligence powered Priority Messages and summarizations.

    105 Apple Mail alternatives

    Cost / License

    • Free
    • Proprietary

    Application type

    Platforms

    • Mac
    • Online
    • iPhone
    • iPad
    • Apple Watch
    Apple Mail screenshot 1
    Apple Mail screenshot 2
    Apple Mail screenshot 3
     
  12. OpenProject icon

    OpenProject

     122 likes
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    Open source software that enhances team collaboration and productivity through features like Gantt charts, issue tracking, Scrum support, and document management. Supports classic, agile, or hybrid management styles while ensuring robust data protection and flexible task assignment.

    201 OpenProject alternatives

    Cost / License

    • Freemium (Subscription)
    • Open Source

    Application types

    Platforms

    • Self-Hosted
    • Software as a Service (SaaS)
    • Cloudron
    OpenProject screenshot 1
     
  13. Claws Mail icon

    Claws Mail

     106 likes
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    Email and news client on GTK+ foundation featuring quick performance, extensible plugins, secure protocols, advanced filtering, strong folder and contact management, lightweight design, powerful search, customizable interface, multi-language support, and encryption.

    62 Claws Mail alternatives

    Cost / License

    • Free
    • Open Source

    Application types

    Platforms

    • Windows
    • Linux
    • BSD
    The main window
     
  14. 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.

    Cost / License

    • Free
    • Open Source

    Application types

    Platforms

    • Windows
    • Linux
    • Online
    • Self-Hosted
    • Flathub
    • Flatpak
    ZetaOffice screenshot 1
     
  15. Zoho icon

    Zoho

     159 likes
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    An all-in-one online office suite designed for businesses, featuring ad-free and privacy-first tools such as word processor, spreadsheet, presentation application, CRM, email/webmail, and hosted wiki. Enables easy real-time collaboration and integration across various platforms.

    51 Zoho alternatives

    Cost / License

    • Subscription
    • Proprietary

    Application types

    Platforms

    • Online
    Zoho screenshot 1
     
12 of 38 Open365 alternatives