ONLYOFFICE
Top pick Open source
FreeFree forever
Overview
ONLYOFFICE is the most compatible open-source alternative to Microsoft Office. It allows you to edit DOCX, XLSX, and PPTX files without formatting issues. It's free, open-source, and privacy-focused, making it the perfect replacement for expensive cloud subscriptions.
Key features
- 100% MS Office Compatibility
- Collaborative Editing
- Open Source & Free
- Available on all platforms