GitFounders3 Open Source Alternatives to Microsoft 365
A list of 3 carefully selected open-source alternatives to Microsoft 365.
The open-source alternatives are ranked based on our custom ranking system and score. This system takes into account various factors to determine the best alternatives.
If you’re looking for alternative features or workflows, here is a prepared detailed list of Microsoft 365 open-source alternatives — each with its own distinctive strengths and key features.
Teable is a next-gen no-code Postgres alternative designed to empower developers and digital solution providers with effortless database management and custom solutions. It offers versatile tools for CRM, event operations, and CMS, making it perfect for projects that demand flexibility and scalability.
Key Features
- Next-gen no-code Postgres platform
- Customizable CRM, event operations, and CMS functionalities
- Advanced dashboards and bulk data editing
- Integrated database toolchain with one-click connections
- Supports direct SQL queries
- Mobile-friendly design
Leveraging limitless scenarios and flexible design, Teable simplifies building robust solutions without code. It features customizable CRM workflows, advanced dashboards for event operations, and visual management for CMS, all integrated via one database connection. Enjoy enhanced SQL querying and one-click integration with popular tools such as AppSmith, Superset, Supabase, Tableau, and more. Its mobile-friendly interface ensures smooth usage on any device while it remains in a technical preview phase with ongoing improvements.
Tuta is an email service with a strong focus on security and privacy, offering encrypted email, contacts, and calendar features on all your devices. It combines robust, quantum-resistant encryption with an intuitive, ad-free user experience.
Key Features
- End-to-end encryption with quantum-resistant cryptography
- Zero-knowledge design ensuring absolute privacy
- Intuitive apps for web, Android, iOS, Windows, macOS, and Linux
- Fully open source clients for transparency and trust
- Renewable energy-powered infrastructure
- Custom domain support and multi-user options for businesses and families
Tuta delivers secure communication by encrypting your emails, calendars, and contacts using post-quantum cryptography. Its zero-knowledge architecture and user-friendly design simplify workflows across web, mobile, and desktop platforms. With support for custom domain integration and multi-user options, Tuta provides a reliable, sustainable platform powered entirely by renewable energy.
SOGo is a fast and scalable modern collaboration suite that streamlines groupware functionalities with open standards. It offers calendaring, address book management, and a full-featured webmail client, making it an ideal solution for both businesses and communities.
Key Features
- Fast and scalable groupware server
- Rich AJAX-based web interface
- Native support for IMAP, CalDAV, CardDAV, and ActiveSync
- Seamless integration with Microsoft Outlook, Apple iCal, and mobile devices
- Efficient resource sharing and permission handling
SOGo provides a robust, open-source groupware server featuring an AJAX-based web interface that supports calendaring, contact management, and full-featured webmail. Utilizing standard protocols such as IMAP, CalDAV, CardDAV, and ActiveSync, it ensures seamless connectivity with clients like Microsoft Outlook, Apple iCal, and various mobile devices. Designed for scalability, SOGo efficiently manages resource sharing and permission handling in diverse production environments.
Price comparison of Microsoft 365 open-source alternatives
| Tool | Tier 1 | Tier 2 | Tier 3 | Details |
|---|---|---|---|---|
 | $0 Free | $3 Revolutionary | $8 Legend | Learn more |
* Pricing shown is based on publicly available information and may not reflect current rates. Visit each tool's website for detailed pricing information and additional tiers.
About Microsoft 365
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Microsoft 365
Microsoft 365 is the productivity cloud that combines best-in-class productivity apps with intelligent cloud services that transform the way your organization can do more with less.