ONLYOFFICE Desktop Editors
FreeA free office suite with outstanding format compatibility
Open Source No Ads No Tracking Offline No Sign-up Cross-platform
Text, spreadsheet, presentation, PDF and form editors in one app, with best-in-class fidelity for docx/xlsx/pptx and an MS Office-like interface — fully offline.
Why we picked it
If Office document compatibility has ever burned you, ONLYOFFICE is worth a look. Its fidelity for docx, xlsx and pptx is among the best of any open-source suite, and complex spreadsheets or decks from others rarely break on open.
The desktop app is AGPL-3.0 open source, its core editors are permanently free, and it runs fully locally with no ads and no forced sign-in. The ribbon-style UI feels familiar, so anyone coming from MS Office gets productive fast.