LibreOffice is a free office suite for individuals, organisations and public bodies. It consists of Writer (word processing), Calc (spreadsheets), Impress (presentations), Draw (drawings and diagrams), Base (databases) and Math (formulas). The OpenDocument format is its focus, and it can also open and edit Office Open XML files. LibreOffice is installed locally as desktop software for Windows, macOS and Linux; a viewer app is available for Android.
LibreOffice is developed by a worldwide community of contributors under the umbrella of The Document Foundation, a non-profit foundation under German law based in Berlin, which also holds the trademarks. The source code is open source under the Mozilla Public License v2.0, so it can be inspected, modified and used without depending on a single vendor. There is no commercial parent company. For a European organisation it is a self-managed option in which documents stay on your own devices unless you connect a cloud service yourself, and the open file format limits lock-in.