LibreOffice
Free, fully-featured office suiteLibreOffice (the successor to OpenOffice) is a free-software, fully-featured office suite, which includes Writer (word processor), Calc (spreadsheets), Impress (presentations), Draw (diagrams), Base (databases), and Math (formula editor).
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Free Software: Free (as in freedom, not price) software puts the user in control by allowing you to use the software for any purpose, modify it, and redistribute it. This also implies that you can examine the source code and see what it does and how it works. This represents a baseline requirement for recommendation in this guide.
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Supports Interoperability: Interoperability increases freedom and usefulness by allowing different systems to work together. When a service is hostile to other services interoperating, particularly a communication service, this places users in a walled garden, which limits choice and can make it difficult to switch to or from an alternative.
LibreOffice has extensive compatibility with Microsoft Office formats, including the ability to view, edit, and create files compatible with Office.