LibreOffice<p>We still see people on social media recommending OpenOffice. Just be aware that it's no longer getting updates, and has multiple year-old unfixed security issues: <a href="https://en.wikipedia.org/wiki/Apache_OpenOffice#Security" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">en.wikipedia.org/wiki/Apache_O</span><span class="invisible">penOffice#Security</span></a> – To be safe, switch to one of the actively maintained successor projects (such as LibreOffice).</p>