Our verdict: the most complete free office suite you can install — open source, signed builds, and zero telemetry make it an easy recommendation.
LibreOffice is the flagship project of The Document Foundation, a Berlin-based non-profit, and the direct successor to OpenOffice. The suite bundles a word processor (Writer), spreadsheet (Calc), presentations (Impress), vector drawing (Draw), formula editor (Math) and database front-end (Base), all built around the vendor-neutral OpenDocument Format with strong compatibility for Microsoft Office files from 97 through 365.
Version 26.2, released in February 2026, focuses on performance and smoother handling of complex documents, and the suite ships in 120 languages. Every release is published with PGP signatures and cryptographic checksums, the entire codebase is open for inspection under the Mozilla Public License 2.0, and the desktop application collects no usage data — a rare combination of depth and restraint in modern productivity software.