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Open365 is a comprehensive, open-source productivity suite offering cloud storage, office applications, and communication tools. Built upon a foundation of open-source technologies like KDE, Seafile, and LibreOffice, it provides a robust alternative to proprietary solutions, emphasizing privacy and control.

Calligra Suite is a comprehensive graphic art and office suite developed by KDE. It provides a rich set of applications for word processing, spreadsheets, presentations, vector drawing, and database management, catering to a wide range of productivity and creative needs.

Apache OpenOffice Calc is a powerful spreadsheet application for analyzing, managing, and presenting data. Part of the OpenOffice suite, it offers a comprehensive range of functions for both casual users and data professionals, providing a free and open-source alternative for handling numbers and lists effectively.

LibreOffice Calc is a powerful and free spreadsheet application, part of the LibreOffice suite. It offers extensive functionality for creating, editing, and managing spreadsheets, including complex calculations, data analysis, charting, and compatibility with various file formats, including Microsoft Excel.

Apache OpenOffice is a comprehensive and free office suite providing essential tools for document creation, spreadsheet analysis, captivating presentations, and more. It offers cross-platform compatibility and support for various file formats.

LibreOffice is a powerful, free, and open-source office suite for text editing, spreadsheets, presentations, and more. It's compatible with a wide range of file formats, including Microsoft Office documents, making it a versatile alternative for personal and professional use across various operating systems.