Excel (officially Microsoft Excel) is a commonly-used spreadsheet tool, and is available as part of the popular Microsoft Office suite of software. Though not strictly speaking a data analysis tool, Excel is often an entry point for working with data because of its familiarity.

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Open Source MS Excel alternatives

Two primary MS Office alternatives exist, both building off of a project called OpenOffice.org which was discontinued in 2011. Development of LibreOffice has been more active, though both offer similar functionality and are available for multiple operating systems.