The best open source alternative to LibreOffice is CryptPad. If that doesn't suit you, we've compiled a ranked list of other open source LibreOffice alternatives to help you find a suitable replacement. Other interesting open source alternative to LibreOffice is Collabora Online.
LibreOffice alternatives are mainly Collaboration & Communication Tools but may also be Productivity & Utilities. Browse these if you want a narrower list of alternatives or looking for a specific functionality of LibreOffice.
Open-source collaboration suite offering encrypted document editing, file sharing, and team workspaces with complete privacy protection.

CryptPad is a privacy-focused collaboration platform that puts security at the forefront of team productivity. Built with end-to-end encryption, every document, spreadsheet, presentation, and shared file remains completely private - even the server administrators cannot access your content.
This open-source suite provides all essential collaboration tools including:
Unlike traditional cloud platforms, CryptPad ensures your sensitive business data never leaves your control. The zero-knowledge architecture means encryption happens in your browser before data reaches the servers, making it impossible for third parties to intercept or access your work.
Perfect for organizations prioritizing data sovereignty, remote teams handling confidential information, and privacy-conscious users who refuse to compromise security for convenience.
Looking for open source alternatives to other popular services? Check out other posts in the alternatives series and openalternative.co, a directory of open source software with filters for tags and alternatives for easy browsing and discovery.
Powerful online document editor with Microsoft Office compatibility. Integrate into your infrastructure or use trusted hosting partners for secure team collaboration.

Collabora Online is a comprehensive open-source document editing suite that enables secure collaborative editing of text documents, spreadsheets, presentations, and drawings. Built for organizations that prioritize data control and privacy, it offers seamless integration with existing infrastructure while maintaining full compatibility with Microsoft Office formats.
Key features include:
Perfect for diverse use cases:
With over 230+ global partners and millions of users, Collabora Online provides a reliable alternative to proprietary office suites while giving organizations complete control over their document editing environment.