Thunderbird
Office
Free desktop email, calendar and contacts from Mozilla.
Available for Windows, macOS, Linux, Android

Full free office suite: documents, spreadsheets and presentations.
Official source: libreoffice.orgLast verified: awaiting review · How we check softwareDeveloper: The Document Foundation
LibreOffice is a free, open-source office suite from The Document Foundation. It includes Writer for documents, Calc for spreadsheets, Impress for presentations, Draw for diagrams, Base for databases and Math for formulas.
It uses the OpenDocument format by default, and it opens and saves Microsoft Office files such as .docx, .xlsx and .pptx. It works fully offline on Windows, macOS and Linux, with no account or subscription.
Open Source Free and open source
Open source: the source code is public, so anyone can inspect it, and it's free to use.
Prices change, so check libreoffice.org for current pricing.
PS> winget install --id TheDocumentFoundation.LibreOffice --exact --source winget$ brew install --cask libreoffice$ flatpak install flathub org.libreoffice.LibreOffice$ sudo apt install libreofficePackage names were checked against each official package registry, and commands install the same software as the official download. Only run commands you understand.
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Office
Free desktop email, calendar and contacts from Mozilla.
Available for Windows, macOS, Linux, Android
Yes. It opens and saves Microsoft Office formats, although documents with complex layouts or macros may look slightly different.
Writer (documents), Calc (spreadsheets), Impress (presentations), Draw (diagrams), Base (databases) and Math (formulas).
Free and open source. It's also open source.
LibreOffice is available for Windows, macOS and Linux. It isn't available for Android and iPhone & iPad.
Yes. Run "winget install --id TheDocumentFoundation.LibreOffice --exact --source winget" in PowerShell or Windows Terminal. The package ID was checked against Microsoft's official Winget repository.
Yes. Run "brew install --cask libreoffice" in Terminal.
Common alternatives include Microsoft 365 and ONLYOFFICE Desktop. See the full list of LibreOffice alternatives for how they differ.
From the official website, libreoffice.org. Aptorise links only to official sources and never hosts installers.