Top pick
Full office suite with strong ODF support and broad import/export filters.
officeodfoffline
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4 tools match your filters
Office suite emphasizing Microsoft Office compatibility and ribbon UX.
officeooxmlbusiness
Also strong
LibreOffice technology in the browser for collaborative editing with self-host and integration options.
officecollaborationself-hostedodf
Honorable mention
Apache-maintained office suite (writer, calc, impress, base, draw) using the OpenDocument Format.
officeodfspreadsheetdocuments