The best open source alternative to ONLYOFFICE Docs is CryptPad. If that doesn't suit you, we've compiled a ranked list of other open source ONLYOFFICE Docs alternatives to help you find a suitable replacement. Other interesting open source alternative to ONLYOFFICE Docs is LibreOffice.
ONLYOFFICE Docs alternatives are mainly Collaboration & Communication Tools but may also be Productivity & Utilities or Business Software. Browse these if you want a narrower list of alternatives or looking for a specific functionality of ONLYOFFICE Docs.
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.
Complete free office suite compatible with Microsoft formats (.doc, .docx, .xls, .xlsx, .ppt, .pptx). Open source alternative with regular updates.

A complete office suite that provides all the essential tools for document creation, spreadsheet management, and presentation design. Built as the successor to OpenOffice, this solution offers full compatibility with Microsoft Office formats including .doc, .docx, .xls, .xlsx, .ppt, and .pptx files.
Key advantages:
The suite includes multiple applications for different document types:
Perfect for businesses, students, and individuals seeking a reliable Microsoft Office alternative without the cost. The active community ensures continuous development and support, making it a sustainable long-term solution for all office productivity needs.