LibreOffice Calc
LibreOffice Calc is a free and open-source spreadsheet application that is part of the LibreOffice productivity suite. It provides tools for data analysis, calculations, charting, and organizing information in tabular form, similar to Microsoft Excel. It supports a wide range of file formats, including its native ODF (OpenDocument Format) and compatibility with Microsoft Excel files.
Developers should learn LibreOffice Calc for tasks involving data manipulation, reporting, and analysis in environments where cost or open-source licensing is a priority, such as in academic, non-profit, or Linux-based development setups. It is particularly useful for creating budgets, tracking project metrics, or processing CSV data when integrated with scripting via macros or external tools.