You searched a paid product
Includes Word, Excel, PowerPoint, Teams, OneDrive, Outlook.
Microsoft 365 does 5 jobs: spreadsheets (Excel), documents (Word), presentations (PowerPoint), real-time co-editing, cloud storage and sync (OneDrive). Most projects replace one or two of them, so pick the job you actually need.
Open-source alternatives to Microsoft 365 that run locally, allow commercial use and need no paid API include GridCraft (spreadsheets (Excel); MIT OR Apache-2.0). CryptPad covers all 5 Microsoft 365 jobs.
End-to-end encrypted collaboration suite with real-time documents, sheets, presentations, forms and an encrypted drive, self-hosted or on public instances.
Clean-room, Excel-style spreadsheet written in pure Rust, with XLSX as its native format, PivotTables, charts and an MCP server. Part of the ArtCraft suite.
Mature free office suite from The Document Foundation with Writer (documents), Calc (spreadsheets), Impress (presentations), Draw, Base and Math.
Free desktop office suite with document, spreadsheet, presentation and PDF editors, built around Office Open XML (.docx, .xlsx, .pptx).
Self-hosted online office suite with document, spreadsheet and presentation editors and real-time co-editing of .docx, .xlsx and .pptx files.
No project meets all of your requirements. The list below shows what you'd need to relax.
We hid them because something is missing, unknown or conflicting. Here's what.
Yes. CryptPad, ONLYOFFICE Docs (Document Server), LibreOffice, ONLYOFFICE Desktop Editors and GridCraft are free to download and run on your own computer without paid API keys. CryptPad covers every job we list for Microsoft 365; the others cover only part of it, so check which job you need.
Yes, with CryptPad (AGPL-3.0-or-later), ONLYOFFICE Docs (Document Server) (AGPL-3.0) and LibreOffice (MPL-2.0). Check the hardware notes and licence conditions on each page before you start.
Yes, with CryptPad (AGPL-3.0-or-later), ONLYOFFICE Docs (Document Server) (AGPL-3.0) and LibreOffice (MPL-2.0). Check the hardware notes and licence conditions on each page before you start.
Confirmed: GridCraft. With conditions: CryptPad, LibreOffice, ONLYOFFICE Desktop Editors and ONLYOFFICE Docs (Document Server). This is not legal advice; read each licence.
CryptPad covers every job we list for Microsoft 365.