OnlyOffice

OnlyOffice is a free office suite developed by Ascensio System SIA, headquartered in Riga, Latvia. It includes cloud and desktop applications for documents, spreadsheets, presentations, and project management.

Key Features:

• Compatible with Microsoft Office formats
• Document editors, spreadsheets, and presentations
• Collaboration features
• Desktop and web-based versions
• Self-hosting available
• Document management and project tools