LibreOffice The European alternative to Microsoft Office (local)

LibreOffice is a free open-source office suite from the German foundation The Document Foundation, based in Berlin. The suite includes six applications: Writer (word processor), Calc (spreadsheet), Impress (presentations), Draw (graphics), Base (database), and Math (formula editor). LibreOffice is available for Windows, macOS, and Linux and supports the Microsoft Office formats DOCX, XLSX, and PPTX in addition to its own OpenDocument format (ODF, ISO standard).

LibreOffice is a pure desktop application that runs entirely locally on the user's computer and does not transfer data to external servers. The Document Foundation is registered as a foundation under German law and is based in Berlin. The software is licensed under the Mozilla Public License v2.0 and can be reviewed by anyone. For real-time browser collaboration, LibreOffice can be combined with Collabora Online or Nextcloud Office.

LibreOffice reads and writes the Microsoft Office formats DOCX, XLSX, and PPTX. For simple documents, compatibility is good; for complex layouts with macros, OLE objects, or advanced pivot tables, display deviations may occur. The native save format is OpenDocument (ODF), an open ISO standard. The Document Foundation is funded through donations, membership fees, and commercial support from certified partners.